222 Engelmann and Gray, 
106. Panaroxra Trexana, DC. Wet. prairies, Houston. 
August. Annual,.as is P. Hookeriana also. 
107. Hymenoparrus AmTEMIsLEFOLIUS, DC. Open oak 
woods, &c.; west of Houston, &c.; flowering from March to 
September. Radical leaves very variable. 
108. HELENIUM TENUIFOLIUM, Nutt. Open woods. Sep- 
~ tember. 
109. Leproropa sBracuypopa, 8 (purpurea.) Torr. § 
Gr. Fl. IL. p. 388. May. 
110. MansmarLia cxsPrrosa, Nutt. Dry prairies, Hous- 
ton, &c. The specific name is singularly inappropriate, at 
least as applied to the Texan plant ; for the stems are single, 
scattered, and not at all cespitose. The lowest leaves are 
often lanceolate-oblong or spatulate. 
111. Eeveres AnkaNsawa, Nutt.; Torr. & Gr. Fl. Il. p. 
411. (E. Texana, Engel. MSS., but agrees very well with 
the original Arkansan plant. A. Gr.) Downs of Galveston 
Island, April, May, and also in November, when it has very 
diffuse and decumbent stems, somewhat woody at the base ; 
but the plant is surely annual. After flowering, the tube of 
the corolla of the outer disk-flowers, as well as those of the 
ray, become enlarged and corky at the base ; and the inner 
part of the disk is sterile. It is quite a handsome plant jj 
cultivation. The numerous rays are pure white above, and 
usually marked with pink underneath. 
112. GNaPHALIUM PuRPUREUM, Linn. var. (G. spicatum, 
Lam.?) . 
113. Euch VigomsiaNUM, Miche. Open meee: March 
to May. 
114. Centaurea Americana, Nutt. Moist pa preis 
Houston. July. 
115. PynnHOPAPPUS e DC. Dry prairies, 
May, June. 
. 116. Losera cnawpuLosa, Walt. Wet prairies and woods. 
September. A more or less scabrous form: bracts lanceolate 
from a broad base; the sinuses of the calyx very slightly re 
