414 ' DESCKIPTIONS OF NEW SPECIES 



inches high, somewhat angular. Nearly allied to S. cor onopif alius: may it not be a variety of that 

 plant introduced by accident? It is not, however, glaucous. 



Senecio *filifolius; %, stem leafy, striated, and, as well as the leaves, arach- 

 noidly tomentose ; leaves pseudopinnate, sessile, segments linear, almost fili- 

 form, about two pair, the margin revolute; corymb few-flowered; involucrum 

 smooth, minutely bracteolate, suboampanulate ; the sepals obtusely carinate, 

 acuminate, about twenty; rays few and revolute; achenium hirsute, pappus 

 copious, as long, or longer than the florets. 



Hae. The banks of the Missouri, towards the Rocky Mountains. With much the aspect of 

 some of the species from the Cape of Good Hope. Leaves a good deal like those of S. abrotanifolius, 

 but whitely tomentose, and divided into a very few simple segments, about an inch long, and a 

 quarter of a line wide. (I have seen but a single small specimen.) 



CROCIDIUM. (Hooker.) 



Capitulum many-flowered, radiate; rays feminine, in a single series, (eight to 

 twelve.) Involucrum in one series, subimbricate, eight to twelve-parted, 

 the divisions ovate, somewhat spreading, at length reflected, the margins of 

 the inner series membranaceous. Receptacle conic, elevated, naked, mi- 

 nutely papillose. Branches of the stigma very short, lanceolate, acuminate, 

 slightly pubescent, not exserted, in the ray very short. Achenium subcy- 

 lindric, pentagonal, the intervals of the ridges densely squamellose at the 

 summit, appearing almost like an external pappus. Pappus deciduous, bar- 

 bellate, almost plumose, very white, and little more than the length of the 

 achenium; the radial achenia wholly similar, (not compressed,) but without 

 pappus. — A remarkably distinct genus, approaching more to the Anthe- 

 midEjE than the present section, but, in fact, a new type, and a stranger in 

 each of the present orders. 



Hab. On the shelving rocks of the Oregon, at the confluence of the Wahlamet; common. A 

 very elegant but fugacious annual, six to eight inches high, sending up numerous simple branches 

 from the base, each terminating in a single clear yellow flower. Radical leaves spathulate, incisely 

 indented, the cauline small, linear, acuminate or subulate, sessile ; pedicel very long, naked. 

 Axills of the leaves floccosely lanuginous. Involucrum smooth and greenish. Rays oblong, nearly 

 entire, twice as long as the involucrum. All parts of the capitulum, except the persisting invo- 

 lucrum, caducous. Border of the discal florets campanulate, deeply five-cleft, the divisions linear- 



