454 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



23. Parosela crenulata (Hook. & Am.) Rose, Coutr. U. S. Nat. Herb. 8: 306. 

 1905. 



Dalea n-enulata Hook. <& Arn. Bot. Beechey Voy. 285. 1836. 



Sonora to Guerrero; type from Jali.sco. 



Slender shrub, sometimes 2 meters high; l)rauches dark browu, glabrous; 

 leaflet.s 7 to 13, elliptic, 2 to 4 mm. long, crenulate. glabrous; racemes dense, 

 1 to 3 cm. long; petals purple; fruit glabrous. " Malva prieta " (Sinaloa). 



The slender branches are used for brooms. 



24. Parosela elongata Rose, Contr. U. S. Nat. Herb. 8: 306. 1905. 

 Known only from the type locality, Jojutla, Morelos. 



Stems 0.5 to 1 meter high, glabrous ; leaflets 7 to 15, oblong, 7 to 1 2 mm. long, 

 glabrous ; calyx glabrous ; petals purple ; fruit glabrous. 



25. Parosela nutans (Cav.) Rose, Contr. U. S. Nat. Herb. 8: 306. 1905. 

 Psoralca nutans Cav. Icon. PI. 3: 1. pi. 201. 1794. 



Dalea nutans Willd. Sp. PI. 3: 1339. 1803. 



Sonora to Yucatfm and Chiapas. Central America. 



Stems slender, suffruticose, .sometimes 3 meters high, purplish, glabrous ; 

 leaflets 11 to 41, oblong, 5 to 10 mm. long, glabrous ; racemes lax ; calyx glabrous ; 

 petals purple; fruit glabrous. " Canchalagna " (Guatemala). 



In Jalisco a yellow dye is obtained from the plant. 



26. Parosela gracillima (S. Wats.) Rose, Contr. U. S. Nat. Herb. 8: 305. 1905. 

 Dalea gracilliwa S. Wats. Proc. Amer. Acad. 22: 404. 1887. 



.Jalisco; type from Guadalajara. 



Stems very slender, suffruticose, procumbent, reddish, glabrous. 30 to 50 cm. 

 long; leaflets 13 to 21. oblanceolate, 1 to 4 mm. long, glabrous; racemes 2 to 

 6-flowered ; calyx glabrous ; petals purple, the banner yellowish ; fruit glabrous. 



27. Parosela diffusa (Moric.) Rose, Contr. U. S. Nat. Herb. 8: 305. 1905. 

 Da.lea diffusa Moric. Mem. Soc. Geneve 6: 536. 1833. 



Dalea f/racilis Hook. & Arn. Bot. Beechey Voy. 286. 1836. Not D. yracilis 

 Kunth, 1824. 



Dalea ramosissima Mart. & Gal. Bull. Acad. Brux. 10^: 41. 1843. 



Chihuahua and Sonora to San Luis Potosi and Guerrero. Guatemala. 



Slender shrub, often a meter high ; branches glabrous, purplish ; leaflets 3 

 to 23, oblong or obovate, 2 to 5 mm. long, glabrous ; racemes lax, 2 to 5-flow- 

 ered ; calyx glabrous; petals purple, the banner usually yellowish; fruit 

 glabrous. " Escoba larga " (Morelos, Seler) ; " raton," " xolteco " (Ramirez). 



As in the case of various other species, the branches are often tied together 

 to form coarse brooms. 



28. Parosela dispansa Rydb. N. Amer. Fl. 24: 59. 1919. 



Known only from the type locality, mountains near Talpa, Jalisco. 



Stems slender, sulfruticose, glabrous, dark brown ; leaflets 9 to 13, elliptic, 

 3 to 5 nun. long, refuse, glabrous ; racemes 1 to 2 cm. long ; calyx glabrous ; 

 petals violet or rose-purple; fruit glabrous. 



29. Parosela submontana Rose, Contr. U. S. Nat. Herb. 8: 306. 1905. 

 Chihuahua to Puebla and Oaxaca ; type from Plateado, Zacatecas. 



Stems slender, suffruticose, 0.5 to 1.2 meters high, glabrous, purplish; leaf- 

 lets 31 to 41, oblong, 5 to 10 mm. long, glabrous : racemes 3 to 8 cm. long, 

 rather dense; calyx glabrous; petals purple; fruit glabrous. 



30. Parosela scandens (Mill.) Rydb. N. Amer. Fl. 24: 114. 1920. 

 Psoralen scandens Mill. Gard. Diet. ed. 8. Psoralea no. 4. 1768. 

 Veracruz. 



