Plantm Lindheimeriance. 263 



Q. obtusiloba ; flowering in February. A small tree, crooked, 

 and much branched ; the earliest flowering species in Texas. 



310. PoTAMOGETON DIVERSIFOLIUS, /3. SPICATUS, Ellgel. in 



Sill. Jour. 46, p. 102. Clear rivulets, in prairies, west of 

 San Felipe. April. Leaves 5-7-13-nerved. 



311. P. natans, Linn., Var. ? foliis infimis elongato-lan- 

 ceolatis utrinque acutissimis pellucidis breviter petiolatis, se- 

 quentibus longius petiolatis sensim magis oblongis et coriaceis, 

 summis natantibus oblongis ellipticisve ; fructibus lenticulari- 

 compressis margine acutiusculis. — In clear water and pools, 

 west of the Brazos. June. Intermediate in its characters 

 between P. natans and P. fluitans ; and in the absence of the 

 upper leaves, very difficult to distinguish from P. lucens. 



312. Xyris torta, Smith, Kunth, Enum. 4, p. IV. (ex 

 char.) Springy places. May. Also, in Drummond's Texan 

 Collection. 



313. Sysirinchium minus (n. sp.) : pumilum ; caule an- 

 cipiti ramoso folioso ; spatha paulo insequali flores sequante 

 vel subexcedente ; perigonii segmentis (cceruleis) ovatis exte- 

 rioribus setaceo-mucronatis ; capsulis obovati-ovalibus glabris. 

 — Margin of pools, &c. in the prairie west of San Felipe. 

 April. Distinguished from the other North American species, 

 by the smaller size of the whole plant (3-6 inches high,) the 

 much branched stem, the ovate, not obcordate or emarginate, 

 lobes of the perigonium, and the form of the capsule. Spathe 

 not mucronate, about 4-flowered. Seeds numerous and very 

 small, impressed-dotted, black. 



314. Habranthus Texanus, Herb. Low prairies of the 

 Colorado, in black, clayey soil ; flowering in September. Pe- 

 rigonium reddish-orange outside, yellow within. 



315. Eleocharis acicularis, R. Br. var. Ponds and 

 pools on Mill Creek. March. 



316. Tripsacum cylindricum, Michx. Prairies. Apri', 



May. 



317. Andropogon macrourus, Michx. September. 



318. Chara polypiiylla, Michx., A. Braun. On the 



