G2 PROCEEDINGS OF THE AMERICAN ACADEMY 



cinate-pinnatifid ; pappus-bristles rather stout, naked at base, these 

 often connate in pairs or threes. 



S. LACTUCiNA, Gray, 1. c. Pappus-bristles slender and plumose to 

 base. 



-I- -t- Naked-paniculate : pappus bright white, soft, very plumose to 

 base: involucre merely calyculate. 



S. TnuRBERi, Gray, PI. Thurb. 325, & Bot. Mex. Bound. 105. 



S. ELATA, Nutt. PI. Gamb. 173, from Sta. Barbara, California, 

 remains unrecognized. Said to have lO-flowered heads, whicli S. 

 virgata, Benth. may sometimes have ; but seems to be excluded from 

 that by " involucre and branchlets sprinkled with resinous dots." 



* * Heads smaller, a quarter to a third of an inch high, rarely larger 

 but narrow, normally 5-flowered, by depauperation sometimes 3-4- 

 flowered, or in stronger plants occasionally G-8- (or 10-?) flowered. 

 — Janiesia, Nees, not Torr. & Gray. 



H— Perennials from tortuous roots or a lignescent base, with junciforra 

 branches : pappus-bristles slender to base. 



S. RUNCINATA, Nutt. Distinguishable from the following by gen- 

 erally stouter habit, larger heads, which are scattered along the main 

 branches, and dull white pappus, the plume not descending quite to 

 the base. 



S. MINOR, Nutt. More slender, and leaves often filiform ; the 

 heads terminating the branchlets ; the pappus bright white and very 

 plumose down to the base. This is the Jamesia paucijlora, Nees in 

 Neuwied Trav., from the Upper IMissouri. 



S. MYRioCLAnA, Eaton, Bot. King Exped. 198, t. 20. A much 

 tufted and very slender-stemmed species, with scattered small heads, 

 akenes striate at maturity ; the bri>tles of the bright white pappus 

 naked at the base. It has recently been rediscovered in Nevada by 

 Mr. Marcus E. Jones. 



+- -h- Annuals or biennials. 



++ Pappus bright white and soft; the bristles slender and plumose to 

 the base : stems, &c. not rarely puberulent or tomentulose. 



S. "WRiGHTir. Seemingly biennial : stem rather slender and tall, 

 corymbosely paniculate above, bearing naked-pedunculate terminal 

 heads, with involucre almost half an inch long: leaves all very narrow, 

 cauline linear-filiform : akenes contracted under the summit, smooth, 

 as long as the long-plumose pappus. — S. rwicinala, var.. Gray, PI. 

 Wright, ii. 103, no. 1301. — W. Texas, Wrig/d. 



