368 DESCRIPTIONS OF NEW SPECIES 
Helianthus Missouriensis; (Scuwe1n11z, MSS. ,) extremely scabrous; leaves 
atenuate, radical spathulate, serrate, cauline oblong obtuse, upper in ear; 
acute; stem dichotomous, the branches diverging, one-flowered; sepa 
minutely ciliate, closely imbricate; stigma lanceolate, hirsute, golden ee 
Has. Plains of Missouri. a allied to H. pauciflorus. al 
Division IV.—Bwentwes. (Lessing. Decand.) 
-  BIDENS. (Linn.) baht. 
Bivens quadriaristata. (. *. tata; leaves remotely dentate, serrate, outer 
involucrum about five-leaved, longer than the oval rays. 
basta ot sesame Island, at the outlet of the Wahlamet, Oregon. 
ra 
= Bidens Calfornica. 
~ ‘Hap. St. Diego and St. Barbara, Upper California; common, ©. Also in Chili. Rays nearly 
white, inclining to yellow, often wanting. 
g. CampyLoTuEca.—(Genus Campytotueca, Cass. Decand.) Achenium linear, 
sometimes curved or contorted, linear and compressed; awns two, small, or 
ae ae 
manting. 
Bidens * mutica; very smooth and herbaceous; leaves ternately or visits 
divided; leaflets ovate-lanceolate, acuminate, serrate; panicle trichotomous; ex- 
terior involucrum a little shorter than the inner; rays about five, twice as long 
as the disk; achenium straight, sparingly pilose, without awns. 
Has. Ouau, Sandwich Islands. Less than a foot high, the lower leaves quinate, the uppermost 
nearly simple. Flowers yellow, rather small; the inner and outer involucrum each about five- 
leaved, Disk dark brown; tube of bass florets non a fang of the border. Branches of the 
stigma terminated by short conic app ium smooth, or with a few scattered hairs, 
transversely striated, sometimes witha ay awn, b t | 
sont three-flowered, the capituli on — pedicels. 
- a sly W ithout any : branchlets of the panicle 
Bidens * gracilis; smooth and + leaves ternately or eee di- 
vided, leafi lanceolate, acuminate, serrate; panicle slender, trichotomous; 
exterior involucram a little shorter than the inner; rays about five, scarcely 
longer than the disk; achenium somewhat curved, with two short awns, having 
a few retrorse bristles towards the extremity. 
