=~ 846 DESCRIPTIONS OF NEW SPECIES 
ments of the leaves, which are nearly smooth above, all of them linear, with 
the fruit lanceolate, acute, and having much fewer spines; there are only ves- 
tiges of palea on the receptacle; most part of the plant is clothed with sparse, 
white hairs, wholly absent in the preceding. 
Division VI.—Ivex. (Decand.) 
Iva cihata. 
Has. Arkansa. The old plant becomes extremely scabrous; achenia turgid, oboval. 
Iva axillaris; leaves mostly alternate, somewhat carnose, linear-oblong, or 
cuneate-oblong, obtuse, nearly smooth, one-nerved; capituli solitary, axillary, 
nutant; involucrum of about five nearly separate, ovate sepals. Hook. Flor. 
Bor. Am., Vol. II., p- 309, t. 106. 
Has. On the borders of the Platte and Missouri. 
Iva * foliolosa; lower leaves opposite, the upper alternate and smaller, all, as 
well as the stem, more or less appressed pilose, three-nerved, lanceolate or ob- 
long-lanceolate, subacute; flowers towards the summit of the stem, solitary, ax- 
illary, nodding; involucrum campanulate, five-lobed. 
Has. On the Rocky Mountain plains. I, axillaris, 8., Hoox. Flor. Bor. Am., Vol. IL., p. 309, 
Probably Pursh’s description i is made up of both these species, though on the Missouri I saw only 
the preceding, of which a specimen was communicated to the Lambertian Herbarium. The pre- 
sent plant has a very different leaf and involucrum, and often presents, as it were, a leafy spike, 
as mentioned by Hooker. 
Iva angustifolia. 
Has. Arkansa. Capitulum minute, about four-flowered, three masculine, one feminine. Flow- 
ers in a paniculated, leafy spike. 
Iva * microcephala; slender and virgately branched, very smooth; leaves nar- 
row linear, , almost filiform, entire and fleshy; capituli axillary, very small; se- 
pals out five, distinct; florets about six, three of them female. 
Has. In Florida. (Dr. Baldwin.) A remarkable species for the minuteness of its flowers and 
leaves, the latter about half an eos long, half a line wide. The capitulum not much larger than 
an ordinary pin’s head. ag 
§ I. * Picrorvs. 
Flowers dioicous, one plant producing masculine flowers only with minute ru- 
diments of fruit, the other with monoecious capituli, the radial florets with- 
out coral the stigmas exserted, slender and filiform. Receptacle naked. 
