Hemizonia. COMPOSITE. 361 



slightly hairy ; those of the ray obovate-oblong and obcoiupressed, tipped with a 

 short inflexed beak. — Hemizonia (Hemizonella) Durandi, Gray, I.e. Harpcecar- 

 pus madarioides, Durand, not of Xutt. 



Dry hills, common through the foot-hills and the Sierra Nevada from Mariposa County north- 

 ward, and in Nevada. 



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

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

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

 with an inflexed apiculation, but not beaked. — Hemizonia (Hemizonella) minima, 

 ( I ray, 1. c. 



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

 Rest, Gray. 



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



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

 flowers several or numerous, hermaphrodite but usually all and always tin' 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. 

 Receptacle flat or conical, chatty only between the ray- and disk-flower's, 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 formed, narrower and seldom truly 

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

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

 rated stems, and one f'rutescent, all Californian, mostly glandular and viscid, heavy- 

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

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

 low or white, with brownish anther's. — Benth. & Hook. Gen. PI. ii. 3'.)4 ; Gray, 

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

 Xutt. Hemizonia & Calycadenia, Torr. & 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. — Hartmannia, Gray. 



* Receptacle flat or nearly so, chaffy only between the ray- and dish-flowers ; tin chaff 

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



of the ray no/nse or someirhat Inhere at ate n-li, n mature, insert, d by a. short and 

 tin. 1,-ish incurved stipe : disk ah in s all si, rile and mostly abort ivi , usually 6( aring a 

 -pappus of small scales. [Hartmannia, DC.) 



-i- Rays and disk-flowers few or several ; the former with tube thickish at ban ; iht 



latter in'f/i conspicuous pappms of chaffy lacerat, ■toothed scales: heads comparatively 

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

 or less carinate toward tin base. 



++ Perennial and woody, exceedingly leafy: rays aim, a s. 



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

 numerous fastigiate flowering branche \<t\ leafy to the top, hirsute, aromatic and 

 viscid : leaves filiform, and with tufts of shorter ones in the axils, entire, or rarelj 



with "ii 'two short lateral lobes: heads thyreoid racemose: involucre nearly gla 



brous : rays8or9; the ligules obovate-oblong, 2 - 3-toothed, aboul the length of 



