STANDLEY TREES AND SHRUBS OF MEXICO. 247 



Leaf blades broadly obovate or rhombic-obovate, acute to acuminate at base. 



1. P. mexicanus. 

 Leaf blades oval-ovate, cordate at base 2. P. cordifolius. 



1. Podopterus mexicanus Humb. & Bonpl. PI. Aequin. 2: pi. 107. 1809. 

 Tamaulipas to Colima, Oaxaca, and Yucattin ; type from Veracruz. Guat- 

 emala. 



Shrub or small tree, sometimes 6 meters high, with stout spinose branch- 

 lets ; leaves deciduous, glabrous ; flowers in dense fascicles, appearing when 

 the plant is leafless, greenish tinged with brown. 



2. Podopterus cordifolius Rose & Standi. Proc. Biol. Soc. Washington 33:66, 



1920. 

 Colima to Oaxaca ; type locality, on the seashore at Manzauillo, Colima. 

 Small tree with very straggling, pendent branches. 



7. ANTIGONON Endl. Gen. PI. 310. 1837. 

 Plants f ruticose or chiefly herbaceous, scandent ; leaves cordate or deltoid ; 

 flowers fasciculate, the fascicles racemose. 



Exterior sepals ovate in anthesis 1. A. guatimalense. 



Exterior sepals cordate in anthesis. 

 Leaf blades decurrent on the petiole. 



Sepals reddish, in fruit nearly as broad as long, obtuse or rounded at 

 apex, usually apiculate ; plants usually copiously pubescent. 



2. A. cinerascens. 

 Sepals yellowish, longer than broad in fruit, acute or acutish ; plants 



nearly glabrous ,_^ 3. A. flavescens. 



Leaf blades not decurrent 4. A. leptopus. 



1. Antigonon guatimalense Meisu. in DC. Prodr. 14: 184. 1856. 

 Polygonum yrandiflorum Bertol. Nov. Conun. Acad. Bonon. 4: 412. 1840. Not 



P. fjrandlflorum Willd. 1799. 

 AntUjonon grandiflorum Robinson, Proc. Amer. Acad. 44: 613. 1909. 

 Guerrero and Oaxaca. Central America and Colombia ; type from Guatemala. 

 Leaves broadly cordate; inflorescence copiously pubescent, the flowers rose- 

 colored ; sepals in fruit about 3 cm. long. 



2. Antigonon cinerascens Mart. & Gal. Bull. Acad. Brux. 10': 14. 1843. 

 Veracruz, Oaxaca, and Chiapas ; tyi>e from Jalapa. Central America. 

 Leaves broadly ovate-cordate, abruptly short-acuminate ; flowers purplish 



red. "Bejuco de colacion " (El Salvador) ; " belllsima " (Nicaragua). 



3. Antigonon flavescens S. Wats. Proc. Amer. Acad. 22:446. 1887. 

 Jalisco to Oaxaca ; type from Chapala, Jalisco. 



Leaves deltoid .often very large, glabx'ous. acute or acuminate; flowers i^reen- 

 ish white or yellowish. " Coamecate," " coamecatl " (Jalisco, Urbina). 



4. Antigonon leptopus Hook. & Arn. Bot. Beechey Voy. 308. pi. 69. 1839-iO. 

 Aniigonon cordatum Mart. & Gal. Bull. Acad. Brux. 10': 14. 1843. 



Chihuahua to Beja California, southward to Oaxaca ; often cultivated else- 

 where ; type from the west coast. 



Large vine, often climbing to the tops of the highest trees, sometimes running 

 over low shrubs ; leaves deltoid or cordate, acuminate ; sepals at first small and 

 inconspicuous but becoming large, purplish red, and very showy, the racemes 

 (as in the other species) furnished with tendrils. " Flor de San Diego " (Vera- 

 cruz, Oaxaca, Yucatan) ; " enredadei-a de San Diego" (Nuevo Leon, Oaxaca) ; 

 " rosa de mayo" (Sinaloa) ; "corona de la reina " (Tamaulipas) : " hierba de 



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