Cosmos.] COMPOSITAE. 217 
with 2—4 stiff persisting retrorsely aculeate or barbed awns. Otherw 
as in Campylotheca, — Annual or perennial herbs with opposite nites 
or pinnately dissected leaves. Flowers eithér large and single at the ends 
of branches and in forks, or numerous, corymboso-paniculate. Florets 
yellow, or rarely the ray white 
A large ae boa over the soomipieiectn and warm regions of the whole world, but 
especially of Am 
Leaves petiolate, ‘isi achenes ss phates : : ; s 1. B. pilos 
Leaves sessile, glabrous; achenes compressed . 2 ya | heyatthenolies, 
+1. B. pilosa, es — DC. i. od. V, 597. — An erect, generally hispid 
annual, 1—11/2 ft. high. Leaves thin, either all simple or, at least the 
upper ones, trisect to trifoliolate, the simple leaves ovate, 1—2' lon 
acuminate, sharply serrate, on petioles of !/,—1’. Flower- ae few in 
a foliose cyme or corymb, about 3“ high, on pedicels of !/2—1'/4‘, com- 
monly discoid (viz., the ray- sper wanting), or with a few whitish ligules. 
Disk-florets 12—20. Style-branches scarcely thickened below the long 
subulate appendage. “Achenes straight, 4-angled, 4—6” long, ciliate or 
e, 2—4-awned, the awns '/s—'/s the length the achenes and 
strongly barbed. — B. leucantha, Willd. — B. hirsuta, Nutt. in Trans. Am. 
Phil. Soe. VII, 369. — Walp. Rep. Il, 618. — B. peduncularis, Gaud.? — 
Bentham, Fl. Hongk. p. 183 
all islands, from the aaah to altitudes of 4000 ft., a plague to cattle and nee 
on account of the pega es achenes. Of American origin, but now a common weed i 
ee aie ddniisieizoihie: Michx. — DC. Prod. V, 595. — A Stadia 
the creeping or floating stem one to several feet long and rooting. 
Leaves lanceolate, 4—6‘ < 1/2—1‘, sessile, the upper ones clasping, acute, 
distantly serrate. Heads radiaté, large, 3—4" high and 6—8” broad, 
inal, one or few on peduncles of 1—2’. Outer sont bracts herba- 
ceous, lanceolate, as long as the inner ones, which are thin, broad and 
colored, Ray-florets 8—12, about 1’ long, yellow. Disk-florets numerous. 
Style-branches clavate, with conical appendages. Achenes broad wedge- 
shaped, compressed, the margins retrorsely ciliate or aculeate, as are the 
2, 3 or 4 — of which the longest about equals the floret. — B, helian- 
thoides, H s 
Oahu! me and Waikiki iuka near Honolulu; Kauai (Remy); in <kalo»-patches 
and slow running streams. Flowers in July and Angust. A native of N. America, East 
and West, where it extends from the northern U. S. to Mexico 
19. COSMOS, Cay. 
Heads radiate, the ray-florets generally red. Achenes narrow, almost 
5-angled or somewhat compressed, the apex attenuate in a beak with 
2—5 persistent retrorsely aculeate awns. Otherwise as in Bidens. Herbs 
About 10 species, belonging to tropical America. 
