AND GENERA OF PLANTS. 389 



two feet high; the flowers racemose, and in strong plants corymbose or with fastigiate few-flowered 

 branches. Involucnim that of madaria; rays shorter, deep yellow, rather showy. Achenium 

 black and smooth, similar to that of Madaria, but without angles. Pappus of the central florets 

 almost like that of Bahia, obtuse and fringed. 



*HARP.ECAIIPUS. 



Capitulum many-flowered, radiate; rays feminine, in a single series, about five 

 to eight, truncated, very short, and two-lobed, scarcely as long as the filiform 

 style. Discal floret one ! tubular, five-toothed, hermaphrodite, fertile. Style 

 scarcely exserted, short, nearly smooth, and somewhat obtuse. Involucrum 

 spherical, five to eight-leaved, the sepals carinate, closely investing the ache- 

 nium, and falling off in connexion with the mature fruit. Receptacle very 

 narrow, containing within the ray a foliaceous, pubescent, and glandular 

 involucrum of five wholly united leaves, surrounding the single hermaphro- 

 dite floret! Achenium of the ray compresse'd, smooth, falcate and granu- 

 lated, produced at the base and summit; central achenium nearly straight 

 and somewhat angular, naked. — Hirsute annuals of Oregon. Stem simple, 

 corymbosely paniculate. CapituH long pedicellate, glandular; flowers mi- 

 nute, -yellow. Leaves linear, entire, the lower ones opposite. A very dis- 

 tinct genus, though still closely allied to Madia; but the falcate achenia fall 

 off invested by the deciduous sepals; and the only hermaphrodite central 

 floret, like a true proliferous flower, is entirely separated by an involucrum 

 similar to that of the ray, and united into an entire, five-toothed cup. The 

 whole plant of an aromatic odour. — (The name from 'aprtj?, a sicMe, and 

 xaprsos, fruit; in allusion to the form of the fruit.) 



Harpcecarpus Madarioides. 



Hab. On Rocky plains in depressions, at the outlet of the Wahlamet. Common ; flowering in 

 May. From a few inches to two feet high. Hirsute with rather long hairs. Leaves about a 

 line wide, one to two inches long, acute, entire, except the radical ones, which are sometimes 

 slightly denticulate. Capitulum glandular, depressed spherical, somewhat smaller than a grain of 

 black pepper. Pedicels various, in the fruiting state two to three inches long, in other smaller 

 specimens the flowers are nearly sessile, except the terminal ones. Flowers pale yellow. 



VII. — 4 X 



