390 DESCRIPTIONS OF NEW SPECIES 



* AMID A. 



(A transposition of Madia, in allusion to its affinity to that genus.) 



Capitulum heterogamous or homogamous, few-flowered ; rays none, or one or 

 two, irregular, very small, ligulate, three-toothed. Discal florets hermaphro- 

 dite, cylindric, one to five. Stigma included, small and obtuse. Recepta- 

 cle naked, very small. Involucrum oblong or ovate, of two to five oblong, 

 or lanceolate sepals, embracing the deciduous fruit. Achenium oblong, 

 compressed, four-sided, naked, and granulated; in the radial florets sheathed 

 with the sepals. — Viscidly glandular annuals, with entire leaves, the lower 

 ones opposite; flowers small, in terminal clusters, bracteolate, bractes and 

 sepals covered with conspicuous, pilose glands. Allied to Madia, and re- 

 markable for its singular depauperation. 



Amida * gracilis; hirsute and scabrous, with close-pressed hairs; sepals con- 

 vex, very glandular. 



Hab. Rocky Mountain plains and prairies of the Oregon. The whole plant fragrant from glan- 

 dular exudation. About a foot high. The stem simple, sometimes branching towards the summit, 

 slender and rigid. Leaves narrow-linear, rather crowded, hirsute, and scabrous, the hairs close- 

 pressed. Flowers small, yellow, in irregular axillar and terminal clusters; involucrum sometimes 

 with only one or two flowers, at other times with five. Rays often wanting. 



Amida *hirsuta; hirsutely pilose with spreading hairs; leaves linear, sca- 

 brous, and ciliated on the margin; sepals hirsute and glandular, carinated. 



Hab. With the above, from which it is distinguished by its pubescence and larger capituli with 

 broader sepals. The rays are also larger and more regular in their association. 



* 



LAGOPHYLLA. 



Capitulum few-flowered, radiate; rays feminine, about flve, ligulate, flat, di- 

 lated, three-lobed, externally pubescent. Discal florets hermaphrodite, ste- 

 rile, five to six. Stigmas hirsute, filiform, equal. Involucrum five-leaved, 

 similar with the leaves, lanceolate, flat, closely sheathing the fruit, the apex 

 free. Receptacle minute, with a verticil of five leaves within the ray, 

 and surrounding the sterile florets. Achenium cuneate, convex externally, 

 and carinated within, perfectly even, (without any granulations,) the rudi- 



