SUNFLOW'EE FAMILY. 529 



Ray-flowers 4 to 8, the ligules minute. Disk-flower 1, the bracts of 

 the receptacle united and forming an enclosing cup, the receptacle 

 otherwise nalced. Achenes slender, laterally compressed. Pappus 

 none. (Greek harpe, a sickle, and karpos, fruit, on account of the 

 shape 01 the ray-achenes. ) 



1. H. exiguus (Gray) Greene. Pauiculately branched, commonly 

 4 to 6 in. high, the leaves narrowly linear; heads IJ to 2 lines long; 

 bracts of the involucre 4 to 8, lunate and strongly carinate, the free 

 tip scarcely any, very hispid-glandular; ruy-achenes ohovate-lunate, 

 pointed by a small disk. — (Madia filipes Gray.) 



Open brush or woods in the mountains of the Coast Rauge.s: north- 

 ern California; Napa Mountains; Cazadero, Srfi-hell; Oakland Hills; 

 Pajaro Hills and southward to Southern California. 



Hemizoxella Gray. Xear Harpaecarpus but the leaves mainly 

 opposite; disk-flowers solitary or rarely 2 to 4; rays minute. H. 

 PAKVULA Gray. Much branched, 2 or 3 in. high; heads subsessile or 

 on slender peduncles; achenes tipped with an incurved beak. — Sierra 

 Nevada; Chamiso Mountain, Mendocino Co., Rattan (seen in the 

 Gray Herbarium, Harvard University). H. minima Gray. One in. 

 high; achenes beakless. — Sierra Nevada. 



47. HEMIZONIA DC. Tarweed. 

 Viscid-glandular and ill-scented annuals with alternate (or the 

 . lowest sometimes opposite) narrow leaves. Flowers yellow or white, 

 in mostly numerous heads. Disk-flowers surrounded by a circle of 

 chaflfy and often slightly united bracts or the disk chafiy throughout. 

 Receptacle flat, its bracts deciduous. Kay-achenes thick, short, 

 turgid, half enclosed by the low^er part of the bract of the involucre 

 which falls with it or is at least deciduous. Disk-achenes sterile, with 

 or without pappus. This and the two following genera were perhaps 

 better received as one. (Greek henii, half, and zonia, zone, the 

 bracts but half enclosing the fruit.) 



A, Ray-achenes not beaked. 



Receptacle with chaffy bracts throughout ; areola of ray-achenes nearly or 



quite central at the summit of the achene; disk-achenes without 



pappus. 

 Rays scarcely surpassing the bracts of the involucre . . . 1. if. c&ngesta. 

 Rays showy," mucn surpassing the bracts of the involucre. 



Heads paniculate or corymbose 2. H. luzulsefolia. 



Heads racemosely disposed along simple branches . . 3. .ff. Clevelandi. 



B. Ray-achenes beaked. 



Receptacle with a circle of bracts surrounding disk-flowers, otherwise 

 naked; leaves without truncate glands. 



Rays 12 to ffi; pappus minute or none ; heads hemispherical 



4. H". corymbosa. 

 Rays 5; pappus of linear paleffi ; heads very narrow. 

 Heads on slender pedicels .... . . o. H. Kelloggii. 



Heads fascicled in small clusters 6. ff. fasciculata. 



Receptacle with chaffy bracts thronghout; leaves of the branchlets with 

 small truncate glands at tip; pappus none. 

 RaTs4or5; leaves crowded on the branchlets . 7. H. virgata. 



Rays 5 to 8; leaves soiittered on the branchlets . . ^. H. H((rmanni. 



3fi 



