STANDLEY TREES AND SHRUBS OF MEXICO. 239 



name is " tlacopatl " (trumpet-medicine). In modern usage this has been modi- 

 fied to " tacopate," " tacopatle." " tacopaxtle," " tacopaste," etc. 

 Calyx limb with 3 long linear lobes. 



Leaves glabrous on the upper surface ; calyx lip about 10 cm. long. 



1. A. tricaudata. 

 Leaves pubescent on the upper surface ; lip about 5 cm. long. 



2. A. malacophylla. 

 Calyx limb not 3-lobate. 



Leaf blades rounded at the base ; plants erect 3. A. arborea. 



Leaf blades cordate at the base ; plants scandent or trailing. 

 Stems and margins of the leaves pilose with long brown hairs. 



4. A. pilosa. 

 Stems and margins of the leaves without long brown hairs, often glabrous. 



Leaves sessile, densely soft-pilose beneath 5. A. asclepiadifolia. 



Leaves long-petiolate, puberulent or glabrous beneath. 



Calyx very large, the limb 18 to 35 cm. broad. Leaves deltoid-cordate, 



puberulent beneath 6. A. grandiflora. 



Calyx smaller, the limb less than 8 cm. broad, often much less. 

 Leaves puberulent beneath. 

 Leaf blades deltoid-cordate, deeply cordate at base. 



7. A. pavoniana. 

 Leaf blades oval or oblong, shallowy cdrdate at base. 



Leaf blades ovate, glabrous on the upper surface, subcordate at 



base; flowers solitary S. A. ovalifolia. 



Leaf blades oblong, puberulent on the upper surface, cordate at 



base; flowers racemose 9. A. maxima. 



Leaves glabrous beneath. 



Leaves acute or acutish, subcordate at base, green beneath ; calyx 



limb 5 to 8 cm. wide 10. A. odoratissima. 



Leaves rounded or very obtuse at apex, deeply cordate at base, 

 pale or glaucous beneath ; calyx limb less than 2.5 cm. wide. 

 Calyx limb somewhat bilobate, the large lobe acute or acumi- 

 nate 11. A. pardina. 



Calyx limb not bilobate, obtuse 12. A. taliscana. 



1. Aristolochia tricaudata Duchartre, 111. Hort. Lem. 12: pi. 523. 1865. 

 Chiapas ; the plant has been cultivated in European greenhouses. 

 Arborescent, with gray fissured bark ; leaves oblong, 12.5 to 20 cm. long, acute 



or acuminate, pubescent beneath ; flowers axillary, solitary, odorless, the calyx 

 limb with 3 long narrow lobes, maroon outside, dark purple-brown within. 



2. Aristolochia malacophylla Standi. Proc. Biol. Soc. Washington 33: 65. 1920. 

 Known only from the type locality, Salto de Zararacua, Uruapam, Michoacan. 

 Leaves oval, 12.5 cm. long, cordate at the base. 



3. Aristolochia arborea Linden ; Hook, in Curtis's Bot. Mag. pi. 5295. 1862. 

 Chiapas, the type locality. Guatemala. 



Erect shrub, 2 meters high, the trunk with corky bark ; leaves narrowly ob- 

 long, about 30 cm. long; flowers clustered near the base of the stem. 



4. Aristolochia pilosa H. B. K. Nov. Gen. & Sp. 2: 116. pi. 113. 1817. 

 Aristolochia ferruginea T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 51. 1914. 

 Oaxaca and Chiapas. Central America to Ecuador (the type locality). 

 Stems slender, scandent; leaves cordate, obtuse or acutish; calyx limb 4 to 5 



cm. long. " Sombrerito," " hediondilla " (Guatemala). 



5. Aristolochia asclepiadifolia T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 178. 



1915. 

 Known only from the type locality, Consoquintla, "Veracruz. 



