AND GENERA OF PLANTS. 383 
* DICH ATA. 
Capitulum many-flowered, heterogamous; rays feminine, oblong, two-toothed. 
_ Discal florets hermaphrodite, five-toothed, with a campanulate summit, 
smooth. Stigmas subcapitate, obtuse, pubescent. Involucrum subcampa- 
nulate, five to twelve-leaved, in a Single series; sepals ovate, ciliate, the same 
number with the rays. Receptacle conic, narrow and elevated, papillose. 
Achenium narrow and acutely conic, angular. Pappus in ray and disk 
similar, of about eight obtuse, small, fimbriated scales, and two, rarely three 
or four, intermediate, separate awns.—Annuals, with opposite, entire, or 
laciniately pinnatifid leaves; flowers terminal, pedicellate, yellow, almost 
- exactly like those of Burrieha, but the plant subaquatic, and with a very 
different pappus.—(The name from the intermediate pappus of mostly two 
awns. ) 
Dicheta * tenella; erect, stem simple, pilose; leaves linear, mostly entire, the 
lower ones somewhat laciniated ; rays and sepals five to eight. 
Haz. On the margins of ponds and wet places. St. Barbara, Upper California. Flowering in 
April. A slender, diminutive plant three or four inches high. Leaves an inch or more long, about _ 
a line wide. Rays scarcely as long as the disk. 
Dicheta * uliginosa; decumbent and branching; stem, peduncles, and often 
the involucrum hairy; leaves laciniately pinnatifid, with a broad rachis, the 
segments linear; rays about eight to twelve, shorter than the disk. 
Han. With the above, but a much larger plant, and almost aquatic. Awns of the pappas 
sometimes three or four. Leaves two to three inches long with a broad rachis, sending off very un- 
equal, linear, narrow, acute segments. 
LASTHENIA. (Cassini.) 
§. Hotocymng.—Rays oblong, conspicuous, as long as the disk. Achenia 
compressed, linear-oblong, glandularly scabrous, and without pappus.—An- 
nual, subaquatic, or terrestrial herbs, with a entire, linear leaves. 
Flowers yellow, terminal, pedicellate. 
Lasthenia glabrata, Decanp., Vol. V., p. 665. Decumbent or erect, and 
branching from the base; smooth, except the pedicels; rays twelve to fifteen, 
