220 Englemann and Gray, 



82. S. tenuifolia, Pursh. Wet prairies. October. 



83. S. leptocephala, Torr. &f Gr. I. c. Wet prairies, 

 Houston. September. — We have two forms; one with 

 broader leaves and larger heads, bearing about 5 disk and 11 

 ray-flowers ; another, with narrower leaves and smaller heads, 

 which have about 3 disk and 10 ray-flowers. 



84. S. Boottii, Hook. ; Torr. &/■ Gr. I. c. Houston. July 

 — September. 



85. S. tortifolia, Ell. With the preceding. 



86. BlGELOVIA NUDATA, /3 V1RGATA, ToTT. fy Gr. I. C. 



Prairies on Chocolate Bayou. September. 



87. Bradburia hirtella, Tori', fy Gr. Fl. II. p. 250. 

 Prairies, in hard, clayey soil, west of the Brazos. July, Au- 

 gust. — The flowers of this very interesting and pretty plant 

 are certainly yellow (a point which could not be positively 

 determined from Drummond's specimens,) and the genus was 

 therefore rightly placed in the homochromous series. 



88. Heterotheca scabra, DC. Houston, &c. July. 



89. Chrysopsis graminifolia, Nutt. ; and 



90. C. pilosa, Nutt. Houston, &c. 



91. Ambrosia coronopifolia, Torr. fy Gr. 1. c. Sub- 

 saline prairies, Galveston Bay, &c. July. 



92. Berlandiera tomentosa, (3 dealbata, Torr. fy Gr. 

 I. c. Sandy prairies west of the Brazos. June. 



93. Zinnia multiflora, Linn. With the preceding. 



94. Echinacea angustifolia, DC. Pine woods near 

 Houston. April, May. The slender and original form of 

 this species, which varies much as does E. purpurea. The 

 peduncles are scarcely incrassated at the summit, the head 

 hemispherical, with 8 to 13 narrow, rose-colored rays. The 

 northern form, (E. sanguined, Nutt.) is a much stouter plant, 

 the peduncle much thickened at the summit, the head twice 

 the size, and at length conical, with 12 to 16 dark red rays. 

 Both forms are quite variable. 



95. RUDBECKIA ALISMiEFOLIA, T07T. fy Gl\ I. C. Houston 



to the Brazos. 



