STANDLEY — TEEES AND SHRUBS OF MEXICO. 1177 



Leaves sessile. 



Corolla 8 mm. long 1. C. peninsulare. 



Corolla 3 mm. long 2. C. palmeri. 



Leaves distinctly petiolate. 



Leaves linear or lance-linear, 5 mm. wide or less 3. C. kunthii. 



Leaves lanceolate or ovate, mostly 10 to 35 mm. wide. 



Flowers about 3 mm. long 4. C. astephanoides. 



Flowers L5 mm. long or less 5. C. sepium. 



1. Cynanchum peninsulare Blake, Coutr. Gray Herb. 52: 83.. 1917. 

 Type from the west coast of the Cape Region, Baja California. 



Stems pubescent at the nodes ; leaves linear, 3 to 8 cm. long, sparsely ap- 

 pressed-pubescent on the margins ; umbels 2 to 7-flowered, subsessile, the pedi- 

 cels 2 mm. long ; corolla glabrous or nearly so ; follicles glabrous, about 10 cm. 

 long. 



2. Cynanchum palmeri (S. Wats.) Blake, Contr. Gray Herb. 52: 83. 1917. 

 Pattallas palmeri S. Wats. Proc. Amer. Acad. 24: 60. 1889. 



Type from Muleje, Baja California. 



Stems sparsely puberulent or glabrate ; leaves linear, 1.5 to 5 cm. long, 

 acute ; umbels 2 to 6-flowered, sessile, the pedicels 2 to 3 mm. long ; flowers 

 yellow ; follicles about 10 cm. long and 6 mm. thick. 



3. Cynanchum kunthii (Decaisne) Standi. 



Cynanchum lanceolatiwi H. B. K. Nov. Gen. & Sp. 3: 203. 1819. Not C. 

 lanceolatum Poir. 1811. 



Orthosia kunthii Decaisne in DC. Prodr. 8: 527. 1844. 



Metastelma angustifoUum Turcz. Bull. Soc. Nat. Moscou 18522: 315. 1852. 



Vincetoxicum, kunthii Hemsl. Biol. Centr. Amer. Bot. 2: 328. 1881. 



Vincetoxicnm mexicanum S. Wats. Proc. Amer. Acad. 18: 115. 1883. 



Chihuahua to Veracruz, Oaxaca, and Durango. Type locality given doubt- 

 fully as "Nova Andalusia" (Venezuela), but this probably is incorrect. 



Very slender vine, chiefly herbaceous, the stems bifariously puberulent or 

 glabrous ; leaves 1 to 5 cm. long, acute, glabrate ; umbels few-flowered, sessile 

 or short-pedunculate, the flowers about 2 mm. long; follicles slender, about 

 5.5 cm. long. 



4. CyTianchum astephanoides (A. Gray) Standi. 



Vincetoxicum astephanoides A. Gray, Proc. Amer. Acad. 22: 435. 1887. 



Type from barranca near Guadalajara, Jalisco. 



Coarse woody vine ; leaves long-petiolate, ovate or lance-ovate, 5 to 7.5 cm. 

 long, acuminate, thin, puberulent ; umbels short-pedunculate, several-flowered ; 

 corolla white, the lobes hairy within. 



5. Cynanchum sepium (Decaisne) Standi. 

 Vincetoxicum sepium Decaisne in DC. Prodr. 8: 526. 1844. 



Type from mountains of Oaxaca ; reported from Hidalgo. Guatemala. 



Slender woody vine, the branches sparsely puberulent ; leaves lanceolate or 

 ovate-lanceolate, 2.5 to 5 cm. long, acuminate, rounded at base, thin, sparsely 

 puberulent above ; umbels pedunculate or subsessile, 4 to 0-flowered. 



11. MELLICHAMPIA A. Gray, Proc. Amer. Acad. 22: 437. 1887. 



The genus consists of a single species. 



1. Mellichampia ligulata (Benth.) Vail, Bull. Torrey Club 26: 425. 1899. 

 Enslenia ligulata Benth. PI. Hartw. 290. 1848. 

 Mellichampia rubescens A. Gray, Proc. Amer. Acad. 22: 437. 1887. 



