Plante Lindheimeriane. 55 
Q. obtusiloba ; flowering in February. A small tree, crooked, 
and much branched ; the earliest flowering species in Texas. 
310. PoramMoGeron pDiIveRsIroLius, 8. spicatus, Engel. 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, 
sumnis 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. SystRINcHIUM MINUS (7. sp.): pumilum; caule an- 
cipiti ramoso folioso; spatha paulo inzequali 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. Hasranruus Texanus, Herb. Low prairies of the 
Colorado, in black, clayey soil; flowering in September. Pe- 
rigonium reddish-orange outside, yellow within. 
315. Exeocnaris acicunaris, R. Br. var. Ponds and 
pools on Mill Creek. March. 
316. Tripsacum cyLinpricum, Michx. Prairies. April, 
May. 
317. Anpropocon macrourus, Michx. September. 
318. CHara. potypHyiia, Michz., A. Braun. On the 
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