348 COMPOSITE H.IRPJSCABPUS 



HEMIZONELLA 



50 HARP.ECARPUS Nutt. 1. c. 



Small annuals with entire narrow leaves and numerous small 

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

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

 carinate-complicate and lunate bracts of the involucre ; disk- 

 flower solitary, tubular, perfect 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. Acbenes glabrous 

 much compressed, without pappus; of the rays obo vat e-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 filipts Gray. Stems slender, 4-12 

 inches high, hirsute, glandular above, paniculately 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, heterogam- 

 ous ; trie 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 en- 

 closing the disk-flowers. Corollas glabrous or merely glandular : 

 rays very short. Achenes obovate or fusiform, more or less ob- 

 compressed and thoS3 of the rays incurved, the small terminal 

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

 wanting. 



H. Durandii Gray 1. c. Hirsute with white hairs and glandular above: 

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

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

 led ; the later ones racemose, 2-braeted at base, short-peduncled : achenes 

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

 with a short inflexedbeak. On dry hills and gravelly bars, Oregon to Cali- 

 fornia and Nevada. 



52 HEMIZONIA DC. 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 



