﻿COMPOSIT.E. 



Tetradtmi. 



microphyllus & L. ambiguus, Nuit. ! in trans. Anu 

 ~ " 3 River, Mr. Tolmie. . 



July-Aug.— Shrub 3-4 



glabrous. Heads pretty large, on'short peduncles', ofte 

 quentiy 5^flowered. Pappus of about 30 bristles, wh 



Country, on Lewis River, Mr. Tolmie. Arid plains with the p 

 . ~ 'feet high. Leaves u: 



airs oft! 



r Hook. ^ Arn. I. c. These copious 

 cuiaie liairs only ditfer from those of tr"^ Tetradymia by tnei 



165. CROCIDIUM. Hook, fl. Bor.-Am. 1. p. 335, L 118. 

 Heads many-flowered, radiate; the ray-flowers about 12, pistillate; the 

 disk-flowers tubular, perfect. Scales of the involucre 8-12, oblong-ovate, 

 herbaceous, with somewhat scarious margins, spreading, nearly in a single 

 series. Receptacle oblong-conical, naked, papillose. Rays oblong; the 

 Hgule with a short filiform tube : the corolla of the disk with a slender tube 

 and a campanulate 5-cleft limb ; the lobes spreading. Branches of the style 

 short; those of the ray very obtuse, nearly included in the tube ; of the disk 

 tipped with a flattened triangular appendage. Achenia obo void -oblong,^ ob- 



hairs (which when moistened split from the apex into two valves, and emit 

 two attenuated spiral threads) ; those of the disk furnished with a deciduous 

 pappus of 15-20 strongly barbellate capillary bristles, rather shorter than the 

 corolla; of the ray similar, but destitute of pappus.— A small annual, send- 

 ing up numerous slender and mostly simple stems (a span high) from the 



floccoje-wootly when very young, at length glabTou^s ^''''^^^'^^^^1^1, 



the cauline linear, sessile. Corolla of the dilk and ray somewhat deciduous, 

 bright yellow. 



C. multicaule (Hook. ! 1. c.)—Nutt. ! in trans. Amer. pkil sac («• 



