Hemizonia. COMPOSIT^E. 361 



slightly hairy ; those of the ray obovate-obloug and obcompressed, tipped with a 

 short infiexed beak. — Hemizonia {IlemizoneUa) Durandi, Gray, 1. c. Harp(icar- 

 2ms madarioides, Duraiid, not of Nutt. 



Dry hills, common through the foot-hills and the Sierra Nevada iVom ilariposa County north- 

 ward, and in Nevada. 



3. H. minima, Gray, 1. c An inch or two high : leaves half an inch or less in 

 lengtli ; the uppermost equalling or barely surpassing the short-peduncled or almost 

 sessile heads : akenes obovate, decidedly obcompressed, glabrous or nearly so, tipped 

 with an infiexed apiculation, but not beaked. — Hemizonia {Uemizoneiia) minima, 

 Gray, 1. c. 



Dry sterile soil in the Sierra Nevada : Soda Springs, Brewer. Between Nevada Fall and Cloud's 

 Rest, Graij. 



57. HEMIZONIA, DC, Torr. & Gray. Tauweed. 



Head many - few-flowered, heterogamous, with 1 to 20 pistillate rays; the disk- 

 flowers several or numerous, hermaphrodite but usually all and always the central 

 ones infertile. Involucre of as many scales as ray-flowers, which are concave and 

 half enclosing their turgid akenes, or sometimes a few loose and empty outer ones. 

 Eeceptacle flat or conical, chatty only between the ray- and disk-flowers, or through- 

 out. Eays 2 - 3-toothed, cleft, or parted : disk-corollas funnelform, 5-lobed. Akenes 

 of the ray turgid, more or less gibbous, obovoid and often triangular, commonly 

 minutely stipitate ; those of the disk, when fornied, narrower and seldom truly 

 fertile. Pappus none in the ray, or in one species rudimentary ; either none or of 

 several chaflfy scales or awns in the disk. — Annuals or biennials, some with indu- 

 rated stems, and one frutescent, all Californian, mostly glandular and viscid, heavy- 

 scented : some of them are Tarweeds or Rosin-iveeds of the Californians. Leaves 

 narrow, all but the lowest alternate : heads middle-sized or small ; the flowers yel- 

 low or white, with brownish anthers. — Benth. & Hook. Gen. PI. ii. 394 ; Gray, 

 Proc. Am. Ac. ix. 190. Hemizonia, Hartmannia, & Calycadenia, DC. Osmadenia, 

 Nutt. Hemizonia & Calycadenia, Torr. k Gray. 



§ 1. Fertile akenes very oblique, the small terminal areola from the summit of the 

 inner angle or face on a narrow beah or apiculation ; the surface dull, often 

 rugose or tuberculate : flowers yellow. — HartMxVNNIA, Gray. 

 * Rece2')tacle flat or nearly so, chafl'y only between the ray- and disk-flowers ; the chaff 

 mostly united into a cup or internal involucre : heads small or middle-sized : akenes 

 of the ray rugose or someivhat tuberculate when mature, inserted by a short and 

 thickish incurved stipe : disk-akenes all sterile and mostly abortive, usually bearing a 

 papjms of small scales. [Hartmannia, DC.) 

 -f- Rays and disk-floivers few or several; the former tvith tube thickish at base; the 

 latter with coiispicuous pappus of chaffy lacerate-toothed scales : heads comparatively 

 small, bracteate, mostly sessile or fascicled : scales of the involucre lanceolate, more 

 or less carinate toivard the base. 



-n- Perennial and woody, exceedingly leafy : rays about 8. 

 1. H. frutescens, Gray. Erect, 2 feet or more high, decidedly shrubby, with 

 numercjus fastigiate flowering branches very leafy to the top, hirsute, aromatic and 

 viscid : leaves flliform, and with tufts of shorter ones in the axils, entire, or rarely 

 with one or two short lateral lobes : heads thyrsoid-racemose : involucre nearly gla- 

 brous : rays 8 or 9 ; the ligules obovate-oblong, 2 - 3-tuothed, about the lengtli of 



