348 COMPOSITjE haep^caepus 



hemizoneli.a 

 50 HARP^CARPUS Nutt. 1. c. 



Small annuals with entire narrow leaves and numerous small 

 heads of inconsqicuous flowers. Heads few-flowered; ray-flow- 

 ers 3-8, pistillate, in a single series, each enclosed in one of the 

 carinate-com plicate and lunate bracts of the involucre; disk- 

 flower solitary, tubular, perftct and fertile, surrounded by a 5- 

 angled and 5-toothed cup formed of the united scales of the rece- 

 ptacle. Corollas glabrous • of the ray scarcely exceeding the in- 

 volucre, tubular below, cleft anteriorly;, of the disk funnelform, 

 5-toothed. Branches of the style in the disk-flower short, lan- 

 ceolate-oblong with barbellate-hispid margins. Achenes glabrous, 

 much compressed, without pappus ; of the rays obovate-lunate, 

 gibbous, the incurved summit produced into a short ascending 

 beak, when mature falling with the bracts of the involucre that 

 enclose them; that of the disk semiobovate, straight, with a trun- 

 cate terminal areola, enclosed by the united chaff. 



H. madarioides Nutt 1. c. Madia filipea Qray. Stem slender, 4-12 

 inches high, hirsute, glandular ahove panieulately branched ; leaves alter- 

 nate, narrowly linear, 1-2 inches long : heads numerous, 1-2 lines high, on 

 long filiform peduncles: bracts of the involucre 4-8, lunate and strongly 

 carinate in fruit, almost destitute of free tips, hispid and glandular: bracts 

 of the receptacle united into a .3-5-toothed cup. Common in open woods, 

 Brit. Columbia to California. 



51 HEMIZONELLA Gray Proc. Am. Acad, ix, 189. 



Little annuals with mostly opposite leaves and numerous small 

 heads of inconspicuous flowers. Heads few-flowered, heteregam- 

 ous; the rays 4-5, pistillate: the disk-flower solitary, or rarely 

 2 or 3, perfect and fertile" bracts of the involucre herbaceous, as 

 many as ray-flowers, each infolded and completely enclosing its 

 achene but rounded on the back and usually flattish on the inner 

 face. Chaff of the receptacle an herbaceous 3-5-toothed cup 

 enclosing the disk-flower. Corollas glabrous or merely glandu- 

 lar: rays very short. Achenes obovate or fusiform, more or less 

 obcompressed and those' of the ray incurved, the small terminal 

 areola oblique, either sessile or raised on a short beak. Pappus 

 wanting. 



H. Dnrandii Gray 1. c. Hirsute with white hair's and glandular above: 

 stem 1-6 inches high, diffusely much branched: leaves linear, about 6 lines 

 long: earliest heads usually in the forks of the branches, slender-pedun- 

 cled; the later ones racemose, 2-bracted at base,^bort-pedunc1ed : achenes 

 slightly hairy ; those of the ray obovate-oblong and obcompressed, tipped 

 with a short inflexed beak. On dry hills and gravelly bars, Oregon to 

 California and Nevada. 



. 52 HEMIZONIA DO. Prodr. v, .692. 



Low annuals with alternate often crowded leaves and middle- 

 sized heads of yellow or white ray-flowers Heads several- to 

 many-flowered ; rays 5-20, ligulate, 2-3-lobed, pistillate : those of 

 the disk tubular, perfect but sterile, 5-toothed, the teeth mostly 



