216 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



8. BRAYTJLINEA Small. 



A prostrate lanate leafy herb from a perennial root, forming thick mats; leaves 

 opposite, ovate, entire; flowers minute, perfect, axillary; calyx campanulate, with a 

 5-lobed limb; stamens 5; fruit an indehiscent utricle. 



1. Brayulinea densa (Humb. & Bonpl.) Small, Fl. Southeast. U. S. 394. 1903. 



Illecebrum densum Humb. & Bonpl.; Roem. & Schult. Syst. Veg. 5: 517. 1819. 



Guilleminea densa Moq. in DC. Prodr. 13 2 : 338. 1849. 



Type locality: "In America Merid." 



Range: Texas and New Mexico to tropical America. 



New Mexico: Water Canyon; Mangas Springs; San Luis Mountains; Organ Moun- 

 tains; Queen; Kingston; Santa Rita. Dry hills, in the Upper Sonoran Zone. 



44. CORRIGIOLACEAE. Whitlow-wort Family. 



1. PARONYCHIA Adans. Whitlow-wort. 



Low herbaceous perennials, lignescent at the base; leaves often acerose, with con- 

 spicuous scarious stipules; flowers solitary or clustered, mostly apetalous; sepals and 

 stamens 5, the former aristate; fruit a utricle. 



KEY TO THE SPECIES. 



Flowers solitary; elliptic leaves scarcely exceeding the bracts; 



plants densely pulvinate 1. P. pulvinata. 



Flowers clustered; linear leaves much longer than the bracts; plants 



not pulvinate, 10 cm. high or more 2. P. jamesii. 



1. Paronychia pulvinata A. Gray, Proc. Acad. Phila. 1863: 58. 1864. 

 Type locality: Rocky Mountains of Colorado. 



Range: Wyoming to Utah and New Mexico. 



New Mexico: Truchas Peak; Wheeler Peak. Open slopes, in the Arctic-Alpine 

 Zone. 



2. Paronychia jamesii Torr. & Gray, Fl. N. Amer. 1: 170. 1838. 

 Type locality: Rocky Mountains. * 



Range: Nebraska and Colorado to Texas and New Mexico. 



New Mexico: Bear Mountain; Organ Mountains; west of Roswell; Knowles; 

 Berendo Creek; south of Torrance; Buchanan; Nara Visa. Dry soil, in the Upper 

 Sonoran Zone. 



45. ALLIOMACEAE. Four-o'clock Family. 



Annual or perennial herbs with usually dichotomous stems, the joints often swol- 

 len; leaves opposite or alternate, usually entire, exstipulate, petiolate or sessile, the 

 opposite ones often very unequal; flowers regular, perfect or sometimes unisexual, 

 mostly subtended by bracts forming a calyx-like involucre; perianth of only a calyx, 

 this usually colored and corolla-like; stamens 1 to many; anthers 2-celled, opening 

 by longitudinal fissures; ovary 1-celled, superior but surrounded by the calyx tube, 

 sessile or short-stalked; stigma usually capitate; ovule solitary, erect; fruit an antho- 

 carp, indehiscent, either fleshy, leathery, or hard, either angled, ribbed, grooved, 

 or winged. 



