AND GENERA OF PLANTS: 345 
Has. Near St. Diego, Upper California. Not more than six inches high, very softly and co- 
piously pubescent; segments of the leaves crowded, Stem slender, simple, scarcely extending 
beyond the bosom of the radical leaves; male spike about two inches long;. involucrum about ten 
or twelve-flowered, five-toothed; receptacle with linear palea, pubescent at the tips. 
Franseria * discolor; 2, root creeping; leaves interruptedly Bipinnatifid, 
above nearly smooth, canescently and closely tomentose, segments subovate, 
acute, confluent in the wide ae stem short, with the lateral branohds de- 
cumbent. 
Has. In the Rocky Gi inisicd' near the Colorado. of the West. A very remarkable and dis- 
tinct, as well as elegant species. Stem about a span long, slightly pubescent; leaves on long pe- 
tioles, with a lanceolate outline, acute, about six inches long, white beneath, green above, the pin- 
natifid segments lanceolate, the rachis incisely toothed. Male florets rather numerous; receptacle 
with narrow, pubescent palea; involucrum about five or six-toothed; female flowers few, fruit 
spiny. 
Franseria * cuneifolia; %, softly sericeous and somewhat canescent; stem 
simple, decumbent, pilose; leaves cuneate-oval, dentate, long petiolate, thre to 
five-nerved at base; male florets very numerous, the scales hirsute at the tips; 
spines of the fruit rigid, sublanceolate; male involucrum ten to twelve-toothed. 
—F. Chamissonis? Lxessine, Decanp., Vol. V., p. 524. 
Has. Outlet of the Oregon, near the sea. A very remarkable species. Stem succulent, about 
two feet long, many from the same root; leaves about an inch wide, two and a half to three inches 
long, the peduncle as long as the leaf. Fruit axillary, crowded, and, as in F. & ipinnatifid 
glandular, with resinous atoms. Achenium large, — all the preceding = ese rte 
corolla is five-toothed. gent 
si 
§ * AmBrosipiIum.—© Palea of the nineaied very y-sleuder and deciduous. 
1a; O; scabrous, and somewhat canescent with appressed 
hairs; stem branching; | flowers paniculate, racemes lateral and terminal; leaves 
bipinnatifid, confluent towards the summit, segments oblong or subovate, ab- 
ruptly acute; involucrum five to eight-cleft, naked, about ten to ‘twenty-flow- 
ered ; fruit ovoid, thickly covered with long, smooth, flat spines. 
Has. In the Rocky Mountains, near the Colorado of the West. One to two feet high; stem 
scabrous, leaves softish to the touch, with closely appressed hairs; chaff of the involucrum decidu- 
ous, or wanting, rachis of the leaves wide. 
Franseria Hookeriana. Ambrosia acanthocarpa; Hook. Flor. Bor. Am., Vol. 
L., p. 309. Dnieigamee from the preceding chiefly by the few linear a 
vil.—4 M ’ 
