262 Engelmann and Gray, 



306. Aphora (vide No. 175, supra) humilis (n. sp.) : 

 strigoso-pilosa ; caulibus basi ramosissimis adscendentibus dif- 

 fasis ; foliis oblongis ovato-lanceolatisve obtusis basi attenuatis 

 brevissime petiolatis superne demum glabratis ; capitulis axil- 

 laribus folio multum brevioribus paucifloris ; petalis in fl. masc. 

 calycem paulo superantibus lanceolatis, in fl. foemineo subulatis 

 glandulis disci brevioribus. — In hard clayey soil, west of the 

 Brazos. March — August. (Also, Texas, Drummond, Col- 

 lection Second, No. 230, and Dr. Wright.) Plant 6 to 8 

 inches high ; the base of the stem ligneous. Leaves an inch 

 or an inch and a half long. The clusters contain one fertile 

 and about four staminate flowers. The fruit and seeds not 

 half the size of those of the two other Texan species ; the 

 latter globose and rugose, as in the other species, at first 

 curiously striate-reticulated, but when old more even. 



307. Tragia brevispica (n. sp.) : multicaulis, ramosa, de- 

 cumbens; ramis apice flexuosis vel subvolubilibus ; foliis e 

 basi cordata truncatave triangulari-lanceolatis (superioribus 

 fere linearibus) irregulariter acute dentatis parce pilosis petio- 

 latis ; spicis folio oppositis multo brevioribus ; flore foemineo 

 ad basin unico, masculis paucis ; capsulis hispidulis. — Black, 

 clayey soil, in the prairies west of the Brazos. May — July. 

 Differs from T. urticoefolia (perhaps not specifically) in the 

 procumbent stems, which often form diffuse tufts two or three 

 feet in diameter, and the smaller and narrower leaves, as well 

 as the short spikes and smaller flowers and fruit ; the latter is 

 less hispid. 



308. Forestiera acuminata, Poir. Banks of the Brazos, 

 near San Felipe. March. It extends as far north as on the 

 Wabash, in Illinois. 1 



309. Querctjs cinerea, Michx. Sandy, hilly soil ; form- 

 ing groves in the prairies west of the Brazos, along with 



1 Ulmus crassifolia, Nult. was sparingly collected by Lindheimer ; the tree 

 was in flower, for the second time, in September. The perigonium is divided to 

 the base into eight linear segments; and the ovary and fruit are villous. 



