Hemizonia. COMPOSITE. 307 



* Akenes rounded on the back and with a ventral angle, destitute or nearly so of basal stipe : 

 rays exserted but rather short: chaffy bracts none or hardly any among the inner flowers- : 

 leaves narrow, quite entire, or rarely a few salient denticulations. (Ambiguous species, with tin: 

 habit, but not the akenes, of Madia.) 



H. "Wheeleri, GKAY. Loosely branching, slender, green, slightly pubescent, minutely 

 glandular above : heads scattered : rays 5 or 0, bright yellow . marginal bracts of the recep- 

 tacle distinct. Bot. Calif, i. 017; Rothrock iu Wheeler Rep. vi. 361, t. 10. Clamlic 

 Mountains, of the southern Sierra Nevada, California, Ruthrock. 



H. citriodora. Simple-stemmed, with short-pedunculate corymbosely panic-led heads, or 

 loosely branched above and heads more scattered, " lemon-scented," cinereously villous-hirsute 

 and above with small pedicellate glands interspersed : rays 8 or 9, greenish-yellow : marginal 

 bracts of the receptacle lightly united into a cup. Madia citriodora, Greene, Cull. Ton-. 

 Club, ix. 63. Northern California, from Siskiyou Co., Greene, to Placer and Sacramento 

 Co., Bohmder (1865), Mrs. Cumin. With specimens from the latter a less villous aud more 

 glandular form, Madia anomala, Greene, ined. 



* * Akenes obovate-triangular, with a dorsal and two lateral angles, the ventral face broad and 

 nearly plane, surface smooth and shining, base usually extended into a (-mall inllexcd stipe, 

 with a whitish callous at its insertion (but sometimes the stipe short or obsolete and the callus at 

 the very base of the akene): recep'acle chaffy throughout: rays either white or light yellow iu 

 the same species, opening only in bright sunshine. 



-f Heads terminating paniculate or usually corymbosely cymose branches. 



H. COngesta, DC. Soft-hirsute or villous, btsi; not lanate, slightly glandular toward the 

 clustered or scattered heads : bracts of the involucre with lanceolate foliaceous tips, little, 

 surpassed by the rays : marginal bracts of the receptacle either lightly conuate or nearly 

 distinct: iuflexed stipe of the akene conspicuous. Prodr. v. 692; Gray, 1. c. (not of Pacif. 

 R. Rep. iv. 109, which proves to be young Lagophylla). California, near Sau Francisco, 

 Douglas, G. R. Vasey. Specimens formerly referred to this still little-knowu species belong 

 to the following. 



H. luzulsefolia, DC. Villous, and below even sericeous-lauate, at least when young, above 

 becoming very viscid-glandular and corymbosely or pauiculately branched : lower leaves 

 elongated, 3-5-nerved : bracts of the involucre with short and broadish herbaceous tips: 

 marginal bracts of the receptacle united into a cup: rays 5 to 10, rather large, white, some- 

 times tinged with pink, or not rarely pale yellow (var. lutescens, Greene, Bull. Torr. Club, 

 ix. 16) : stipe of akene as iu the preceding, or shorter, or obsolete. Prodr. 1. c. ; Gray, 1. c. 

 H. serlcca, Hook. & Arn. Bot. Beech. 356. //. rudis, Benth. Bot. Sulph. 31, a very branch- 

 ing and late-flowering form. Dry open grounds, throughout western part of California, 

 very common from San Francisco Bay to Monterey. Varying greatly. 



H -i Heads disposed to be sessile along simple branches. 



H. Cleveland!, GREENE. More slender, below villous with long spreading hairs, not lanate . 

 leaves all narrowly linear, mostly one-nerved : heads smaller, nearly all after the terminal 

 one subsessile in the axils or on short leafy brauchlc-ts, thus as it were spicately or race- 

 mosely disposed : ravs white : akenes and flowers as in the smaller-headed form of the 

 preceding. Bull. Torr. Club, ix. 109. California, from Meudociuo Co. (Kellogg) to Lake 

 Co., Bolandcr, Cleveland. 



2. HARTMA"XNIA, Gray, 1. c. Ray-akencs opaque and often rugose or 

 tuberculate (rarely smooth and shining), very gibbous, turgid, the terminal areola 

 from the summit of the inner angle or face, and by gibbosity commonly intra- 

 apical, raised on a little beak (rostellum) or apiculation : flowers in all yellow : 

 ours annuals. Hartmannia (excl. spec.) & part of Hemizonia, DC. Prodr. 



IT. FRUTESCEN-S, Gray, Proc. Am. Acad. xi. 79, & Bot. Calif, i. 361, an outlying species 

 from Guadalupe Island, off Lower California, is remarkable for having a woody-based stem, 

 and is probably the only species that is really perennial. This and 



H. STREETSII, Gray, 1. c. xii. 162, from San Benito Island, Lower California, arc the only 

 known representatives of the genus beyond the limits of this Flora. 



