CCiMPOSlTAiE (composite FAMILY)' 533 



4. Baccharis Emoryi Gray, Bot. Mex. Bound. 83. 1859.' Erect; with 

 slender branches, 1-4 m. high:, cauline leaves mpstly oblong or the lower 

 broader, with attenuate or cuneate base and the larger somewhat petioled, 

 more or, less triple-nerved, of teri with 2-4 short lobes or teeth; those of the 

 branches oblanceolate to i linear, mostlyi entire, l-heryed: heads . somewhat 

 nakedly paniculate on the branchlets, short-pedunculate or ithe glomerules 

 more or less pedunculate; involucre' earnpanulate or oblong, 5-7 |mn). long, 

 mostly, of firm coriaceous and obtuse bracts,; the outermost oval, the inner 

 oblong, the innermost thin, linear, and acutish. — Southern California to 

 Nevada and Arizona, and reported from southwestern Colorado. ' 



31. FILAGO L. 



Low woolly annuals with small more or less glomerate headsj Receptacle 

 hemispheric^al or conical. Fertile pistillate flowers in 2 sets, the outer set 

 separated from tHe inner by a circle of open, scarious or chaff-like nearly gla- 

 brous bracts; flowers of the outier set, which is borne on' the margin of the 

 receptacle, commonly destitute of pappus, each loosely- infolded by a concavei 

 or boat-shaped long-woolly bract; flowers of the, inner set provided with a 

 pappus of copious capillary tristles, not Ihfoldeii'ty bracts,,, Herrnaphrodite 

 flowers in the center of the head few, often fertile, their pappus abundant. 

 Achenes terete or nearly so, either smooth or minutely granular.— .Btioi 

 Gaertn. 



1, 'Filago prolifera' (Nutt.) Brit'. Mem. Torr. Bot. Cteb 5: '329. 1894. 

 Rather stout; stem 7-12 cm. high, simple and erect, or with ascending branches 

 from the base, bearing numerous small spatUlate le'aves and a capituliform 

 glomerule, 10-12 mm; in diameter, whence proceed 1-3 nearly leafless 

 branches -siWiilarly tetminatfed; sortieftimes again proliferous: fructiferous 

 braets scarious, oval or oblong, mainly naked; those embracing staminatc' 

 flowers more hetbaceious and woolly-tipped, of firmer or more herbaceous 

 te!*ture: staminate flbwers each on d, filiform stipe represfehtihg an abortive 

 ovary. Evax prolifera. — Dakota, Colorado, and southward. ' 



■'";'"•,';' , 32. AKTENNARIA* Gaerlln. """'',,. 



Dioecious or polygamo-dioecious perennial herbs with alternate leaves and 

 many-fldwered heads ' of inconspicuous flowers. Heads' discoid ; the pistillate 

 flowers with filiform truncate corolla shorter than the'2-cleft style ; the stami- 

 nate ■with lutular '5-lobed corolla and style with undivided truncate apex. In- 

 volucre of imbricated, scarious, persistent bracts, at least their tips white or 

 colored. Receptaele flat or convex, naked.' Achenes small, nearly terete or 

 flattish, mostly glabrous. Pappus a sinigle setiefg'of capillary bristles, those of 

 the fertile flowers ■<rery slender; connate at base,' and sO falling 'from the achene 

 ina body; those of the sterile often crisped, mostly thickened at the apex. ' ■ ' 



PLANTS SURCULOSE-PROLIFEROUS WITH LEAFY STOLONS 

 Leaves comparatively small^ 5-f2& mm.'lQng. - , . ; 



Tips of involucral bracts green or brown, , 



Stems very flen<ier, ^7 cm. high ' . . .1. A. media. 



St^msmedium, 8-^5 cm. high.' '■ ' ■ ji.t. 



', ' Sheaves broadly .spatulate; involucres 6-r7 mm. high ^ . 2. A. iusca.. i 



Leaves spatulate-ol;)|^nceolatc; involucres about 5 mm. high. ,, .n ' ' 



' Leaves obtuse, tomentose ' '. ."' . , . . . 3. A. reflexa. 

 I Leaves' acut^, 'canesceht . .- . . . : 4. A. umbrinella. " ' " 



Tips of .involucral bracts' not brown or green. ' ■, _, • ,;■ 



.Heads comparatively small, involucres 5 (4—6) mm. high. 

 Tips of involucral bracts rose-color or rarely whitish. 



Leaves narrowly oblanceolate, acute , .'' , . 5. A. rosea. 



Leaves spatulate, obtuse ' . '. . . • . i , . . , 6. A. concinna. 



* The treatment of > this genOs is largely an adaptation from Prof. Elifts Nelson's clear 

 and discriminating revision of a large part of the genus, in Proc. V. S. 'Nat, Museum 23; 

 e97-71'3. 1901. ' ' . ' ,: 



