COMPOSITE. 197 



** Pistillate flowers in one series. Achenia obcompressed, obovoid. 



5. G. supinum Vill. : cespitose ; flowering stems simple, slender, woolly 

 above ; leaves linear, woolly ; heads oblong, solitary, terminal, or few and 

 spicate-racemose ; scales of the involucre oblong, acuminate, brown ; ache- 

 nia puberulent. Omalotheca supina D. C. 



White mountains, N. H. Nult. N. to Labrador. l^.Stem 24 inches 

 high. Low Alpine Cud-voeed. 



47. FILAGO. Tourn. Cotton Rose. 



(From the Latin jHum, a thread; in allusion to the cobweb-like threads which 

 cover the plant.) 



Heads many-flowered, heterogamous ; the terminal or central 

 flowers numerous, pistillate, perfect or infertile, tubular, 4 5- 

 toothed ; the others filiform, pistillate, scarcely-toothed. Scales 

 of the involucre few, the outer ones woolly. Receptacle elon- 

 gated, filiform, chaffy. Pappus of the central flowers filiform ; 

 of the outer none or dissimilar. 



F. Germanica Linn. : stem dichotomous or proliferously branched at the 

 summit ; leaves linear-lanceolate, acute, tomentose ; heads few-flowered, in 

 subglobose clusters, terminal and dichotomal ; scales of the involucre awned. 

 Gnaphalium Germanicum Willd. 



Fields and pastures. N. Y. to Virg. July, Aug. . Stem 4 8 inches 

 high, more or less branched, woolly-tomentose. Heads small, in roundish capi- 

 tate clusters. Scales of the involucre yellowish, very acute. Introduced. ? 



Herba Impia. 



48. ANTENNARIA. Gart. Antennaria. 



(Named in allusion to the bristles of the pappus, which resemble the antennas 

 of some insects.) 



Heads many-flowered, dioecious ; the corolla tubular ; in the 

 pistillate flowers filiform, 5-toothed. Scales of the involucre 

 imbricate, colored, scarious. Receptacle convex, alveolate. 

 Achenia nearly terete. Pappus in a single series ; in the pis- 

 tillate flowers filiform ; in the staminate clavate. 



1. A. plantaginea R. Brown: stem simple, with procumbent shoots; 

 leaves silky-villous when young, but when old smoothish above and ca- 

 nescent beneath ; radical oval, petiolate, 3-nerved ; cauline linear ; heads in 

 a small crowded corymb. Gnaphalium plantagineum Linn. G. dioicum 

 var. plantaginifolium Mich. 



Woods. Hudson's Bay to Flor. W. to the Rocky Mountains. April June. 

 1\.. Stem 38 inches high, downy. Radical leaves often large and broad. 

 Heads few, (sometimes a single large one,) oblong, pedicellate, with a white" 

 involucre. Plantain-leaved Cud-weed. 



2. A. margaritacea R. Drown : stem erect, tomentose ; leaves linear- 

 lanceolate, acuminate, 1-nerved, green and lanuginous above, tomentose 

 beneath ; heads in a terminal corymb. Gnaphalium margaritaceum Linn. 



Woods and fields. Can. to Car. W. to Oregon. Aug., Sept, *2L Stem 



