AND GENERA OF PLANTS. 429 
: . 
* RAFINESQUIA. 
Capitulum many-flowered. Involucrum subcylindric-conic, caliculate; sepals 
equal in length, imbricated in about two series, linear and acuminate. Re- 
ceptacle naked, puncticulate. Achenia subterete, subulate, scarcely striate, 
somewhat rugose, terminating i in a long, filiform rostrum; the external series 
pubescent. Pappus plumose, i in several series.—An annual, much-branched, 
tall, smooth herb of Upper California, with the € aspect of a Sonchus. Leaves 
amplexicaule, runcinate-lyrate, flowers in loose corymbs; the branches mi- 
crophyllus; caliculum rather short and spreading, the segments linear-subu- 
late. Flowers small, white, externally dark purple in the centre of the 
—diguli. Allied pe to CO Nha bas ery. distinct i in habit.—( Dedi- 
cated to the me Imost in: 
times an accurate obser eR but lies unfortunate monomania was that of 
giving innumerable names to all objects of nature, and particularly to plants.) 
Rafinesqua Californica. 
Has. Near the sea-coast, in the vicinity of St. Diego, Upper California. An annual growing to 
the height of two or three feet, and nearly erect. Stem terete , and Purp somewhat divaricately 
branched, branches fastigiate, tending to a corymb at t ‘aves more or less deeply 
and runcinately pinnatifid, amplexicaule, lanceolate, and acute Floral branches with minute 
reflected PEN Involucrum rather long, at first almost eylindsie; but quickly enlarging at the 
base, t ic in the manner of the Sow Thistle. Sepals twelve to ae 3 all of the same 
height, but in two series, with membranous margins; the calieulum squarrose an short. Florets 
very fugacious : and small, only opening for a few hours, and but little exserted, toothed at the apex. 
The outer row of achenia pubescent, with short appressed | hairs, all somewhat rugulose, attenuated 
into a rostrum about one and a half times its length, and slenderly filiform; the crown of pappus 
- copious, and softly ae the rays fragile. I have had this plant in vies sc in Jawai 
but itis now lost é 
re 
Subtribe vi. Lactucrz. (Lessing., Decand.) : = 
Oxzs. Achenium linear ob 
and internally grooved. 
vil.—9d H 
