Calymma:^dra. COMPOSITE. 263 



their axils. Chaff falling away when the achenia ripen, all nearly equal in 

 length, scarious, glabrous towards the base, that of the perfect flowers woolly 

 throughout, somewhat herbaceous, obtuse, shorter than the flowers, but in- 

 vesting the achenia, just as those of Micropus are enclosed by the scales of 

 the involucre. In the latter, the exterior and pistillate flowers are thus in- 

 vested : in this remarkable genus, on the contrary, the central staminate 

 (and fertile) flowers are enclosed, to which circumstance the generic name 

 alludes. 



61. FILAGINOPSIS. 



Heads subglobose-ovoid, collected in dense umbelliform clusters, many- 

 flowered ; the fertile flowers pistillate, numerous, and in many series in the 

 axils of the linear-oblong and obtuse (woolly-tipped) flat and scabrous equal 

 chaff of the receptacle, with a filiform truncate corolla ; the 2-5 central sta- 

 minate, with a tubular-infundibuliform 4-toothed corolla, sessile and with no 

 vestige of an ovary, subtended by as many of the chaffy scales of the recep- 

 tacle, and nearly equalling them in length. Involucre of few scales en- 

 tirely similar to the chaff of the receptacle, and only distinguishable by having 

 no flowers in their axils : involucrate bracts mostly 5, in a single series, ob- 

 ovate-spatulate, herbaceous, with scarious margins, very woolly. Receptacle 

 flat or somewhat convex, papillose-punctate. Style in the staminate flowers 

 undivided; in the fertile with short filiform branches. Achenia oval, smooth 

 and glabrous, slightly obcompressed (that is parallel with the chaff), entirely 

 destitute of pappus. — Annual woolly herbs, with the aspect of Filago (natives 

 of Mexico and Texas), much branched from the base, diffuse. Leaves ob- 

 long-spatulate, entire, sessile. Heads in involucrate (siaiple or proliferous) 

 woolly glomerules, terminating the branches. 



This genus differs from Evax in the broad and flat receptacle, obtuse chaff, ikc. ; 

 from the Diaperia of Nuttall in the roundish veiy many-flowered heads, the narrow 

 chaff numerous in each series, the sessile sterile flowers, &c. 



1. F.multic.aulis : glomerules often proliferous ; chaffof the sterile flowers 

 linear-spatulate, somewhat herbaceous and Avoolly throughout, slightly in- 



'volving the entirely glabrous corolla. — Evax multicaulis, DC. ! prodr. 5. p. 

 459. E. verna, Raf.! herb. 



Texas, Berlandier ! Drummond ! Dr. Leavenworth ! (the former also ob- 

 tained it in Mexico.) — Plant 3-G inches high, witli rather slender diffuse stems 

 and branches, clothed with long loose wool. Leaves one-fourth to half an 

 inch long ; the involucrate ones unequal and often shorter than the irregular 

 clusters." Heads ovoid ; the chaff all but the inner series glabrous except at 

 the summit, where the long wool is densely matted and coherent, while the 

 base separates from the receptacle when the achenia are mature. 



2. F. Drummondii : glomerules seldom proliferous : chaff of the sterile 

 flowers entirely similar to that of the fertile, or wanting; the corolla (sterile), 

 like the chaff, clothed with lone; woolly hairs at the summit. 



Texas, Drummond /— Plant^4-8 inches high, more loosely branched than 

 the preceding, which it exceedingly resembles. Heads fewer in a cluster 

 and rather larger, very many-flowered, liemispherical-obovoid; the oblong- 

 linear chaff all similar and of the same length, clothed towards the tips with 



