STANDLEY TKEES AND SHRUBS OF MEXICO. 455 



Glabrous shrub with brown branches; leaflets 7 or 9, elliptic, 8 to 15 mm. 

 long, glabrous; spikes short, globose or oblong; calyx tube nearly glabrous, 

 the lobes plumose ; petals yellow. 



31. Parosela capitulata Rydb. N. Amer. Fl. 24: 113. 1920. 

 Known only from the type locality, in Oaxaca. 



Glabrous shrub with purplish brown branches; leaflets 11 or 13, oblong, 3 

 to 4 mm. long, glabrous ; spikes capitate ; calyx tube sparsely hairy, the lobes 

 plumose; petals brownish purple (when dry). 



32. Parosela tehuacana Rydb. N. Amer. Fl. 24: 113. 1920. 

 Known only from the type locality, Tehuac^n, Puebla. 



Low shrub with brown glabrous branches; leaflets obovate, 3 to 7 mm. long, 

 sparsely short-villous when young but soon glabrous ; spikes globose ; calyx 

 tube pilose, the lobes plumose ; petals yellow, turning dark purple ; fruit vil- 

 lous above. 



33. Parosela domingensis (DC.) Millsp. Field Mus. Bot. 1: 21. 1895. 

 Dalea domingensis DC. Prodr. 2: 246. 1825. 



YucatSn. Cuba and Hispaniola (type locality). 



Shrub, 1 to 4 meters high, the branches villous; leaflets 5 to 9, oval or obo- 

 vate, 6 to 15 mm. long, villous on both sides ; spikes becoming 2 to 4 cm. long ; 

 calyx pubescent, the lobes plumose; petals ochroleucous, turning pink or 

 purple ; fruit villous. 



34. Parosela humilis (Mill.) Rydb. N. Amer. Fl. 24:114. 1920. 

 Psoralea hiundlis Mill. Gard. Diet. ed. 8. Psoralea no. 7. 1768. 

 Dalea thyrsiflora A. Gray, Proc. Amer. Acad. 5:177. 1861. 

 Parosela thyrsiflora Vail, Bull. Torrey Club 24: 14. 1897. 



Chihuahua to Y'ucatAn and Oaxaca; type from Veracruz. Texas; Guatemala. 



Slender shrub with brownish villous branches ; leaflets 3 to 9, oval or obovate, 

 6 to IS mm. long, retuse, sliort-villous; spikes short and dense; calyx pubescent, 

 the lobes plumose ; petals yellow, turning brownish purple. 



35. Parosela occidentalis Rydb. N. Amer. Fl. 24: 115. 1920. 

 Parosela platyphylla Rydb. N. Amer. Fl. 24: 115. 1920. 

 Sonora and Sinaloa ; type from Culiacan(?), Sinaloa. 



Shrub, 1 to 1.5 meters high, the branches villous ; leaflets 5 to 15, oval or obo- 

 vate, 5 to 15 mm. long, villous ; spikes 1 to 3 cm. long, dense ; calyx villous, the 

 lobes plumose ; petals yellow, turning brown or purplish ; fruit villous. 



36. Parosela melantha (Schauer) Rydb. N. Amer. Fl. 24:108. 1920. 

 Dalea melantha Schauer, Linnaea 20:746. 1847. 



Parosela fuscescens Rydb. N. Amer. Fl. 24: 109. 1919. 

 Coahuila to Veracruz and Oaxaca (type locality). 



Shrub with glabrous branches; leaflets 5 to 13, cuneate, 2 to 6 mm. long, 

 retuse, glabrous ; spikes 1 to 4 cm. long, 1 cm. thick ; petals yellow ; fruit pilose. 



37. Parosela zimapanica (Schauer) Rydb. N. Amer. Fl. 24:109. 1920. 

 Dalea zimapanica Schauer, Linnaea 20: 746. 1857. 



Mexico, Hidalgo, Puebla, and Oaxaca ; type from Zimap^n, Hidalgo. 



Shrub, 1 to 3 meters high, with glabrous branches ; leaflets 11 to 19, elliptic or 

 oblong, 2 to 6 mm. long, glabrous ; spikes 1.5 to 3 cm. long, 1.2 to 1.5 cm. thick ; 

 calyx silky-villous ; petals yellow, turning purplish brown or brownish pink; 

 fruit villous. 



This has been reported from Mexico as Dalea microphylla H. B. K. 

 55268—22 19 



