STANDLEY TREES AND SHRUBS OF MEXICO. 477 



It is not at all certain that the name Aeschynomene longifolia Cav. does not 

 apply to this plant. That species was based upon flowering specimens, and the 

 leaves illustrated resemble those of S. mexicana quite as much as those of 

 Dauhentonia cavanillesii. 

 3. Sesban macrocarpa Muhl. ; Ell, Bot. S. C. & Ga. 2: 221. 1788. 



Aeschynomene picta Cav. Icon. PI. 4:7. pi. SlJf. 1797. 



Seshan picta Pers. Syu. PL 2: 316. 1807. 



Usually along streams or in wet soil, Baja California and Sonora to Guerrero 

 and Veracruz. Southern United States ; Central America. 



Shrub, 1 to 4.5 meters high ; leaflets numerous, 1 to 3.5 em. long, pale green ; 

 flowers large, yellow, racemose ; fruit slender, 10 to 30 cm. long. " Zacate de 

 agua " (Jalisco); " bequilla " (Sonora, Palmer). 



21. BENTHAMANTHA Alef. Bonplandia 1862: 264. 1862. 



Unarmed herbs or low shrubs; leaves odd-pinnate, with 3 to many thin, 

 rather small leaflets ; flowers small, racemose ; fruit linear, compressed, bival- 

 vate. 

 Pedicels and rachis of the inflorescence glandular-pilose. 



Leaflets sericeous on the upper surface 1. B. glandulifera. 



Leaflets glabrous on the upper surface 2. B. greenmanii. 



Pedicels and rachis without gland-tipped hairs. 



Leaflets glabrous on the upper surface 3. B. glabrescens. 



Leaflets pilose or sericeous on the upper surface 4. B, mollis. 



1. Benthamantha glandulifera (Benth.) Alef. Bonplandia 1863: 264. 1862. 

 Tephrosia glanduUfera Benth. PI. Hartw. 115. 1843. 



Cracca glanduUfera Benth. Nat. For Kjobenhavn Vid. Medd. 1853: 8. 1853. 



Benthainantha glandulosa Rose, Contr. U. S. Nat. Herb. 10: 99. 1906. 



Chiapas. Central America and northwestern South America ; type from 

 Guayaquil, Ecuador. 



Shrub, 60 cm. high, or sometimes herbaceous; leaflets about 13, oval, 1 to 2 

 cm. long, sericeous beneath ; flowers purplish yellow, 1 cm. long. 



2. Benthamantha greenmanii (Millsp.) Britt. & Baker; Millsp. Field Mus. 



Bot. 2: 50. 1900. 

 Cracca greenmanii Millsp. Field Mus. Bot. 1: 299. pi. 13. 1896. 

 Yucatan and Canipeche ; type from Chichen Itzil, Yucattin. 

 Plants low, suffrutescent or herbaceous. 



The roots bear numerous tubers as in B. glabrescens. Probably these tubers 

 are borne by all the members of the genus. 



3. Benthamantha glabrescens (Benth.) Alef. Bonplandia 1862: 264. 1862. 

 Tephrosia glabrescens Benth. Bot. Voy. Sulph. 81. 1844. 



Cracca glabrescens Benth. Nat. For. Kjobenhavn Vid. Medd. 1853: 9. 1853. 



Benthamantha pximila Rose, Contr. U. S. Nat. Herb. 10: 99. pi. 30. 1906. 



Benthamantha tuberosa T. S. Brandeg. Univ. Calif. Publ. Bot. 4: 376. 1913. 



Chihuahua to Puebla and Veracruz ; reported from Nuevo Le6n. Type from 

 Colombia. 



Plants decumbent, herbaceous or suffrutescent, bright green and glabrate; 

 leaflets oval or rounded-oval, 0.5 to 2 cm. long. 



The roots bear numerous tubers 1 to 10 cm. long, resembling small sweet 

 potatoes. 



4. Benthamantha mollis (H. B. K.) Alef. Bonplandia 1862: 264. 1862. 

 Tephrosia mollis H. B. K. Nov. Gen. & Sp. 5: 463. 1821. 



Cracca mollis Benth. Nat. For. Kjobenhavn Vid. Medd. 1853: 4^ 1853. ^ 

 Cracca edwardsii A. Gray, PI. Wright. 2: 35. 1853. ' 



