248 Engelmann and Gray, 



251. Bellis integrifolia, Michx. A form with smaller 

 heads and fewer rays than usual. Prairies. April — May. 



252. Solidago angustifolia, Ell., Torr. &f Gr. I. c. Wet 

 prairies (and even on dry soil) and banks of rivulets, very 

 remote from salt water. June — August. 



253. Isopappus divaricatds, Torr. &f Gr. Fl. II. p. 239. 

 Light sandy soil. August — September. 



254. I. Hookerianus, Torr. (^ Gr. I. c. Sandy prairies 

 and on sandstone rocks on the Colorado. September. The 

 specimens vary from six inches to two feet high ; some are 

 simple, others much branched from the base. The rigid 

 leaves are narrowly spatulate-lanceolate ; the heads pretty 

 numerous, on short erect peduncles. 



255. Grindelia inuloides, Willd. Prairies west of San 

 Felipe. July — August. Stem five to six feet high, branch- 

 ing only above. 



256. Caly.mmandra Candida, Torr. fy Gr. I. c. Open 

 woods west of the Brazos. April — May. 1 



257. Silphium scaberrimum, Ell. Woods near Industry. 

 May — July. 



258. Halea Ludoviciana, Torr. fy Gr. Fl. II. p. 304. 

 Sandy post-oak woods, west of the Brazos. May — August. 

 — Lowest leaves rhombic-ovate, or ovate-lanceolate, acute or 

 acuminate, abruptly contracted into winged petioles, nearly 

 as long as the blades, which are somewhat connate at the 

 base. Exterior involucre with four rather strongly marked 

 salient angles at the junction of the scales, whitish-tomentose 

 inside. 



259. Helianthus lenticularis, Dougl. Low woods and 

 wet prairies. July — August. In rich bottom woods it often 

 attains the height of ten or twelve feet, with the lower leaves 

 six to eight inches broad. Flowers two and a half to three 

 and a half inches in diameter ; achenia oval, thicker than is 

 usual in the genus. 



1 Pterocaulon virgatum, DC. A few specimens of what appears to be this 

 West Indian species, were gathered near Houston, in open pine woods. September. 



