中國西南（雲南東南麻栗坡／文山／馬關，貴州西南興義，廣西西部那坡）與越南北部。各方描述略有出入：中國國家重點保護野生植物平台另列「重慶」，本文查無其他來源佐證，列為存疑、不建議採信；GBIF標本顯示越南廣平省（約北緯17.7度，地理位置已進入越南中部）也有採集紀錄，與多數文獻慣用的「分布於北越」描述有出入，故本文用「北越至可能的中越」這種較寬鬆的說法。廣西北部木論自然保護區2021年的棲地調查也記錄了本種，落在傳統「廣西西部」的範圍之外。

原生種，小萼亞屬（Paphiopedilum subgenus Parvisepalum）成員，與德氏兜蘭（P. delenatii，該亞屬的模式種）、杏黃兜蘭（P. armeniacum）、硬葉兜蘭（P. micranthum）、白花兜蘭（P. emersonii）、番薯兜蘭（P. hangianum）、越南兜蘭（P. vietnamense）同亞屬，是真正的近緣種。一份越南的DNA研究（ITS＋matK序列）把本種與硬葉兜蘭、白花兜蘭、番薯兜蘭歸為同一個分支，但沒有指出哪一個是本種單一的最近親——本文不替讀者下這個判斷。特別提醒：本種常與其他同樣生長在石灰岩上的兜蘭（例如同域常見的長瓣兜蘭P. dianthum、硬葉兜蘭以外的其他近緣物種）混為一談，但共享棲地不代表血緣相近——只有小萼亞屬內的上述幾種才是真正的近緣種。另需更正一項常見的錯誤資訊：本種由陳心啟與吉占和於1984年發表（《植物分類學報》22(2):119），並非坊間偶爾看到的「1989年」或誤植的命名人組合。

越南北部另有一個常被稱為P. jackii的類群，花形較窄、唇瓣偏小黃綠色，退化雄蕊偏白中心帶黃綠；Kew的POWO資料庫將其視為獨立種，但《中國植物誌》與多位學者則把它當成本種的變種處理——兩套分類系統目前並存，本文採取「P. jackii，部分學者視為本種的一個變種」這種中性寫法，不替讀者選邊站。另有一個更稀少的類群var. hiepii，僅知分布於越南北部單一地點，2025年一篇越南期刊論文將其列為野外滅絕（Extinct in the Wild）。

石灰岩山區森林下的岩縫、石壁積土或富含腐植質的落葉層中，常見於常綠闊葉林或針闊混交林下，林下腐葉堆積層可達10–20公分厚，林冠覆蓋率根據一篇越南期刊論文的正文與表格數字落在50–70%之間（但該文摘要寫70%以上，與正文不一致，本文採用較具體的正文數字）。土壤酸鹼度方面，唯一查到的實測數據來自廣西北部木論保護區的一個種群，4個採樣點pH值落在6.55–7.82之間（接近中性至微鹼性）——但這只是分布邊緣一個種群的數據，雲南、貴州與越南主要種群都查無土壤pH實測值，不宜當成全種的通則。

各方數字不一致，完整範圍大致落在450–2,000公尺之間，但多數來源集中在500–1,600公尺：中國植物誌系統文字給出1,100–1,600公尺（偏高），另一份中文資料給500–2,000公尺（範圍更寬），越南研究則多落在500–1,500公尺之間（偏低）。概括地說，越南種群傾向分布帶的較低端、雲南種群傾向較高端。

葉片4–7片，二列互生，革質，長約7–18公分，上表面有深淺綠色交錯的網紋或斑紋，下表面淺綠常帶紫斑並具稜脊。花梗長25–40公分（偶達60公分，部分來源給出30–65公分），被白色柔毛，初期彎垂、後漸直立。單花（偶有雙花）。花徑各方數字不一，落在5–13公分之間（中國植物誌給5–10公分，其他來源給7.5–13公分）。植株具走莖（stolon），會逐漸擴散成叢生株型。

野外花期集中在3–4月（《中國植物誌》記載1–4月）；花芽約9–10月出現，冬季期間發育會明顯停滯，栽培者普遍回報從可見花芽到真正開花，所需時間長且落差很大，各方回報從約3個月到6–9個月都有，差異相當懸殊。最值得一提的是本種花朵的持久度：一篇2017年發表於《Frontiers in Plant Science》的研究實測11種兜蘭的花朵壽命，本種平均達55.3±1.1天，是該研究裡最長壽的物種之一——這比偶爾可見到的「本種清晨3-4點天還沒亮就開花」這類查無實據的說法更值得認識的科學事實。

《中國植物誌》記載「微香」，栽培者多形容為淡淡的覆盆子或蘋果覆盆子調，但本文查無針對本種香氣成分的化學分析研究，不宜具名列出任何香氣化合物。傳粉生物學方面，本種目前查無任何已發表的專門研究：市面或網路上偶爾提及的「食蚜蠅被花朵上模擬蚜蟲的黑色斑點欺騙而傳粉」這套機制，實際上是中國學者團隊針對長瓣兜蘭（P. dianthum）與小葉兜蘭（P. barbigerum）這兩種完全不同亞屬（並非小萼亞屬）物種做的研究，不能直接套用到本種身上。本種真正的近緣種裡，已有研究的硬葉兜蘭與杏黃兜蘭，傳粉機制是蜜蜂類經由食源性欺騙完成，與食蚜蠅／模擬蚜蟲完全是兩套不同的機制——但這兩種近緣種的資料，同樣不能直接當成本種自己的傳粉證據，只能作為同亞屬植物傳粉策略的參考背景。

CITES附錄I（兜蘭屬全屬皆列）；IUCN紅色名錄評估為瀕危（Endangered，2020年修訂版，原始評估2015年）。中國2021年新版《國家重點保護野生植物名錄》已將本屬多數物種列為一級保護，本種很可能也在其中，但本文未能逐一核對官方名錄原文，列為「極可能、尚待確認」。越南紅皮書將本種列為瀕危，估計野外成熟個體僅3,000–5,000株，許多子種群僅10–50株、且多數不在保護區範圍內；越南單產var. hiepii更已被列為野外滅絕。美國蘭花協會的資料直指本種「極度受威脅」，並提到昆明花市曾出現售價僅30–50元人民幣的野採個體，側面印證野外盜採壓力持續存在；中文媒體報導亦將本種列為常見走私蘭花之一。目前查無針對本種的量化族群下降數字（中國境內）。

栽培本身不難——最佳的物種專屬資料來源（美國蘭花協會McHatton 2009年文章）形容本種「栽培適應力很強」；真正的挑戰在於穩定開花：花芽發育期特別怕熱、所需時間長且落差大，加上冬季需要一段明顯轉涼轉乾的休息期才容易成功催花。整體評為：維持生長容易，穩定開花中等偏難。

查無本種專屬的精確lux數值或遮光百分比。栽培者普遍描述為「溫暖、遮蔭、潮濕」，部分回報「中等到偏亮，但不可直射」，也有來源形容「喜遮蔭但能接受晨間陽光」。可參考同亞屬近緣種杏黃兜蘭的數字（約1,800–2,500 fc明亮散射光，無直射，需良好空氣流通）作為同亞屬植物的大致對照，但須明確標註這是近緣種的數字、非本種專屬資料。整體方向：比一般多花性兜蘭稍暗一些的明亮散射光，避免正午直射。

生長季可耐溫暖：栽培者回報日溫27–31°C沒有問題。冬季需要明顯轉涼轉乾的休息期——多方栽培者的共識夜溫約12–15°C（最低限），部分人甚至低到約7°C也沒有不良影響；物種專屬來源指出原生地冬季夜溫可低至接近0°C，但這是原生地氣候資料、不是栽培建議，栽培環境普遍遠比原生地冬夜溫暖。花芽發育期特別需要保持涼爽：多位栽培者回報花芽遇熱（尤其夏末形成的花芽）容易中途停止發育甚至脫落，建議花芽期維持在攝氏18–20°C以下，物種專屬來源也明確警告不要為了催花而刻意升溫，反而容易讓花苞掉落。

生長季建議約60–80%（多位栽培者回報集中在75–85%），冬季可明顯降低。查無本種耐受低濕度的專屬證據——不建議假設本種特別能忍受低濕，良好空氣流通比單純追求高濕度更重要。

本種生長於石灰岩，但這不代表盆植需要額外加鈣——這點與本店先前一篇肯塔基杓蘭（Cypripedium kentuckiense）文章揭穿的「北美杓蘭耐鹼喜石灰」迷思性質相同，請務必留意，不要重蹈覆轍。本種最佳的物種專屬栽培資料來源（美國蘭花協會McHatton 2009年文章）明確指出，野外的石灰岩依附關係，更可能與種子發芽所需的共生真菌有關，而非成株本身的鈣需求，並警告額外添加的鈣依形式不同，可能大幅推高介質酸鹼度，遇到硬水時甚至可能累積到有害濃度；另有知名兜蘭栽培作者也主張不必常規加鈣，並指出小萼亞屬裡有些物種在野外既能長在石灰岩上，也能以附生方式長在樹上——但這是指該類群整體，並非每一株本種個體都如此。查到的唯一土壤pH實測值（6.55–7.82，見「棲地」欄）來自廣西北部一個分布邊緣種群，不是盆植的建議酸鹼度目標，目前查無任何本種專屬的盆植pH建議值。介質配方沒有單一標準，常見做法是細至中粒樹皮混珍珠石，或酌量加水苔與活性碳；因本種具走莖、會橫向擴散，建議使用寬而淺的盆（寬約為深的兩倍）或吊籃，深盆容易悶濕。若想補鈣，用稀釋液肥裡的鈣鎂補充劑是比直接在介質裡加蚌殼灰或白雲石灰更溫和的做法。

生長季澆水要足量，排水務必良好；冬季則明顯減少，但各方對「減到多乾」意見不一——物種專屬來源主張冬季可以讓介質完全乾透再澆（形容類似多肉植物的澆水邏輯），但同亞屬近緣種的資料與其他栽培者回報則主張即使在冬天也不要讓介質完全乾透。本文把兩種說法都列出，因為各有支持者：排水良好這件事，比糾結要乾到什麼程度更重要。查無本種特別耐硬水／高礦物質水的證據，不建議假設本種對水質有特殊耐受度；硬水地區一般建議改用雨水或逆滲透水。避免水分長期積在生長點造成腐爛。

生長季建議稀釋至約1/4濃度的均衡型液肥，每1–2週施用一次；冬季大幅減少或停止，並定期以清水澈底沖洗介質，避免肥鹽堆積。

全年常綠，沒有真正落葉休眠，但冬季一段明顯轉涼轉乾的「休息期」被多方資料視為穩定開花的關鍵，休息期長度通常建議至少一到兩個月。

Southwest China (SE Yunnan: Malipo, Wenshan, Maguan; SW Guizhou: Xingyi; SW Guangxi: Napo) and northern Vietnam. Sources disagree at the edges: one Chinese protected-species platform additionally lists "Chongqing," which no other source corroborates — flagged as unverified and not recommended for citation. GBIF specimen records show collections from Quảng Bình, Vietnam (roughly 17.7°N, already into central Vietnam), at odds with the "northern Vietnam" phrasing used by most literature, so this guide uses the looser "northern, and possibly central, Vietnam." A 2021 habitat survey of Mulun Nature Reserve in northern Guangxi also documents this species, outside the traditionally cited "southwest Guangxi" range.

A native species in Paphiopedilum subgenus Parvisepalum, genuinely related to P. delenatii (the subgenus's type species), P. armeniacum, P. micranthum, P. emersonii, P. hangianum, and P. vietnamense. A Vietnamese DNA study (ITS + matK sequencing) grouped this species with micranthum, emersonii, and hangianum in the same branch, but did not identify a single closest sister species — this guide doesn't make that call for readers either. Worth flagging specifically: this species is often lumped in with other limestone-growing Paphiopedilum it happens to co-occur with (for example P. dianthum) — sharing a rock face is not the same as sharing ancestry; only the Parvisepalum species listed above are genuine relatives. Also worth correcting: it was described by Chen and Tsi in 1984, not the "1989" or mismatched author combination occasionally seen repeated online.

A narrower-petaled, smaller-lipped population in northern Vietnam is often called P. jackii, with a whitish staminode centered yellow-green; Kew's POWO treats it as a full species, while Flora of China and several authors treat it as a variety of this species — both systems currently coexist, and this guide uses the neutral phrasing "P. jackii, treated by some authorities as a variety." An even rarer population, var. hiepii, is known from a single location in northern Vietnam and was assessed as Extinct in the Wild in a 2025 Vietnamese journal paper.

Rock crevices, soil pockets on cliff faces, or humus-rich leaf litter in limestone-karst forest — typically evergreen broadleaf or mixed broadleaf-conifer forest, with litter depth reported at 10–20cm and canopy cover, per the results and tables of one Vietnamese paper, at 50–70% (that paper's own abstract is internally inconsistent, saying over 70%; this guide uses the more specific results figure). On soil pH, the only measured values found come from a northern Guangxi population at the edge of the range: 6.55–7.82 across four sites (near-neutral to mildly alkaline) — but that's one edge-of-range population; the core Yunnan, Guizhou, and Vietnamese populations have no measured soil pH, so this shouldn't be treated as a species-wide rule.

Sources disagree: the full reported envelope runs roughly 450–2,000m, but most sources cluster 500–1,600m. Flora of China's text gives 1,100–1,600m (higher); another Chinese source gives 500–2,000m (wider); Vietnamese research mostly falls 500–1,500m (lower). Broadly, Vietnamese populations trend toward the lower end of the range, Yunnan populations toward the higher end.

4–7 leaves in two ranks (distichous), leathery, 7–18cm, the upper surface tessellated with dark and light green patches, the underside pale green often spotted purple with a keel. The scape runs 25–40cm (occasionally to 60cm; other sources give 30–65cm), white-hairy, hooked at first then upright. A single flower per stem (rarely two). Flower size is reported inconsistently, roughly 5–13cm across depending on the source (Flora of China gives 5–10cm, others 7.5–13cm). The plant is stoloniferous and gradually spreads into a clump.

Wild flowering peaks March–April (Flora of China gives January–April). Buds appear around September–October and development stalls noticeably through winter; growers widely report that the time from a visible spike to an open flower is both long and highly inconsistent, with estimates ranging from roughly three months to six or nine. The most notable fact here is flower longevity: a 2017 study in Frontiers in Plant Science directly measured flower lifespan across 11 Paphiopedilum species and found this one averaged 55.3 ± 1.1 days — one of the longest-lived in that study, and a far more solidly sourced curiosity than the unverified "opens before dawn, around 3–4am" claim sometimes repeated about this species.

Flora of China records it as "slightly fragrant," and growers commonly describe the scent as a light raspberry or apple-raspberry note, but no chemical analysis of this species' fragrance compounds was found, so this guide doesn't name specific scent compounds. On pollination specifically, no published study of this species' own pollinator exists. A claim sometimes repeated online — that hoverflies are lured in by flower markings mimicking aphid colonies — actually describes research done on P. dianthum and P. barbigerum, two species in a completely different subgenus (not Parvisepalum), and doesn't transfer directly to this species. Among its genuine relatives, the two with documented pollination (P. micranthum, P. armeniacum) are pollinated by bees through food-source deception — a different mechanism entirely from aphid-mimicking hoverfly lures — but even that data describes the relatives, not a confirmed mechanism for this species itself.

CITES Appendix I (genus-wide); IUCN Red List: Endangered (2020 revision of a 2015 assessment). China's 2021 national protected-species list uplisted most Paphiopedilum species to the strictest category, and this species is very likely included, though this guide could not independently verify the official list text word for word — flagged as "very likely, not independently confirmed." Vietnam's Red Data Book lists it as Endangered, with an estimated 3,000–5,000 mature individuals remaining, many subpopulations down to 10–50 plants and mostly outside protected areas; its Vietnam-only variety, var. hiepii, has already been assessed Extinct in the Wild. The American Orchid Society's material calls it "extremely threatened" and notes wild-collected plants reportedly selling for as little as 30–50 yuan at Kunming flower markets — a sign collection pressure persists — and Chinese-language reporting lists it among commonly smuggled slipper orchids. No quantified population-decline figure specific to the Chinese populations was found.

Not difficult to keep alive — the best species-specific source (American Orchid Society) calls it "a very adaptable species in cultivation." The real challenge is flowering it reliably: bud development is slow, inconsistent, and specifically heat-sensitive, and a distinctly cooler, drier winter rest is widely treated as necessary. Overall: easy to grow, moderate-to-advanced to bloom consistently.

No verified species-specific lux figure or shade-cloth percentage was found. Growers commonly describe conditions as "warm, shady, humid," with some reporting "medium to fairly bright but no direct sun" and others "shady but tolerates morning sun." A numeric figure from its close relative P. armeniacum (roughly 1,800–2,500 fc, bright diffused light, no direct sun, good airflow) can be used as a same-subgenus reference point, but is explicitly not species-specific data. General direction: bright, diffused light somewhat shadier than typical multifloral Paphiopedilum, no direct midday sun.

Tolerates warmth in active growth — growers report daytime highs of 27–31°C without issue. Winter needs a distinctly cooler, drier rest: grower consensus puts the minimum night temperature around 12–15°C, with some reporting success as low as roughly 7°C; the species-specific source notes native-habitat winter nights can approach 0°C, but that's climate data, not a cultivation target — cultivation runs noticeably warmer than native winter lows. Bud development specifically needs to stay cool: multiple growers report that heat during bud development, especially for buds set in late-summer warmth, causes stalling or bud drop; recommended practice is keeping developing buds at or below roughly 18–20°C, and the species-specific source explicitly warns against raising temperature to rush a bud along, which tends to backfire.

Roughly 60–80% recommended during active growth (several grower reports cluster 75–85%), noticeably lower in winter. No verified evidence this species specifically tolerates low humidity — don't assume unusual tolerance; good airflow matters more than chasing a high humidity number.

This species grows on limestone in the wild, which does not mean its pot needs added calcium — the same trap this series flagged once before with a "Cypripedium kentuckiense needs lime" myth, worth watching for again here. The best species-specific cultivation source (American Orchid Society) explicitly states the wild limestone association more likely relates to mycorrhizal fungi needed for seed germination, not the adult plant's calcium requirement, and warns added calcium — depending on the form used — can raise mix pH significantly and, with hard water, build to harmful levels; a respected Paphiopedilum grower-author makes a similar point, noting that some Parvisepalum species can be found epiphytic on trees as well as on limestone in the wild — an observation about the group rather than this species specifically. The one soil pH measurement available (6.55–7.82, see Habitat above) is from an edge-of-range population, not a pot-culture target — no species-specific pot pH recommendation exists in the literature. There's no single standard mix; fine-to-medium bark with perlite is common, sometimes with added sphagnum or charcoal; because this species is stoloniferous and spreads sideways, a wide, shallow pot (roughly twice as wide as deep) or a basket is generally recommended, since deep pots tend to stay too wet. If calcium supplementation is wanted, a Cal-Mag fertilizer additive is a gentler route than adding limestone chips directly to the mix.

Water generously in active growth with excellent drainage; cut back markedly in winter — but sources disagree on how far: the species-specific source recommends letting the mix dry out completely between waterings in winter ("similar to a succulent"), while relative-species data and other grower reports recommend never letting it dry out fully even in winter. This guide lists both because both have real support — drainage matters more than exactly how dry the mix gets. No verified evidence this species tolerates hard or high-mineral water better than other Paphiopedilum — don't assume it; hard-water areas are generally advised to switch to rainwater or RO water. Avoid water sitting at the growth center, which risks rot.

A balanced fertilizer diluted to roughly 1/4 strength, applied every 1–2 weeks during active growth; cut back sharply or stop in winter, and flush the mix periodically with plain water to prevent salt buildup.

Evergreen, with no true leaf-drop dormancy, but a distinctly cooler, drier winter rest — typically at least a month or two — is widely treated as key to reliable flowering.