Aristolochia Linnaeus 1753
Creators: name: Do, Truong Van
name: Hoang, Thao Thi
name: Wen, Fang
name: Wanke, Stefan
name: Forbes, Malcolm
name: Souladeth, Phetlasy
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Piperales
Aristolochiaceae
Aristolochia

description: Key to the species of Aristolochia from Laos   
 1. Perianth strongly curved; utricle slightly differentiated; tube U- or horseshoe shaped (in side view); gynostemium 3-lobed........................................................................................................................................................................................ 2 (subgen. Siphisia)   
 - Perianth straight or slightly curved; utricle well-developed; tube rectilinear or slightly curved (in side view); gynostemium 6- lobed..............................................................................................................................................................4 (subgen. Aristolochia)   
 2. Limb cylindric or saccate-shaped …............................................................................................................................... 1. A. laotica   
- Limb trumpet-shaped, or discoid or nearly so................................................................................................................................... 3  
 3. Leaf lamina broadly ovate to cordate. Cymes 3–4-flowered, formed in old woody stems, in clusters of 6–8(–10); limb trumpetshaped….............................................................................................................................................................. 2. A. faviogonzalezii   
 - Leaf lamina narrowly elliptic to lanceolate-elliptic. Cymes 1–2-flowered, axillary, solitary or paired; limb discoid or nearly so.......................................................................................................................................................................................... 3. A. versicolor   
 4. Leaves deeply 3-lobed.....................................................................................................................................................4. A. pothieri   
- Leaves entire.......................................................................................................................................................................................5  
 5. Stems zigzag. Petiole less than 0.5 cm long......................................................................................................... 5. A. harmandiana   
- Stems not zigzag. Petiole more than 1 cm long.................................................................................................................................6  
 6. Leaf base cuneate. Seeds not winged................................................................................................................................ 6. A. indica   
- Leaf base slightly to deeply cordate. Seed winged.............................................................................................................................7  
 7. Leaf blade broadly ovate, twice as long as broad, glabrous on both sides. Seeds warty on one side....................... 7. A. acuminata   
 - Leaf blade narrowly oblong-lanceolate, three-four times longer than broad; puberulous on abaxial leaf surface. Seeds warty on both sides.......................................................................................................................................................................... 8. A. pierrei
description: Published as part of Do, Truong Van, Hoang, Thao Thi, Wen, Fang, Wanke, Stefan, Forbes, Malcolm & Souladeth, Phetlasy, 2023, Aristolochia laotica (subgen. Siphisia), a new species from Northeastern Laos, pp. 155-163 in Phytotaxa 591 (2) on page 161, DOI: 10.11646/phytotaxa.591.2.7, http://zenodo.org/record/7797540