432 DESCRIPTIONS OF NEW SPECIES 



' ceptacle naked. Achenia smooth, linear-lanceolate, somewhat compressed^ 

 sharply ten-ribbed; the outer series abortive, tabescent; the apex attenuated 

 into a filiform rostrum about twice its length, the base with a callous cica- 

 trice. Pappus short and white, of slender subscabrous hairs. — Perennials 

 with long tap-roots and laciniated, incise or pinnatiM leaves. Stems scapoid, 

 naked or bracteolate ; the involucrum large, subtended at base by numerous 

 large, and usually dissimilar bractes. Flowers yellow. Nearly allied to 

 Macrorliynclius, but of a different habit, with conspicuous flowers; an abor- 

 tive, external series, an involucrum of many leaves, and an achenium merely 

 ribbed. — -(The name alludes to the long stipe of the pappus.) 



§. I. Caliculum of many series, wholly leafy, dissimilar to the involucrum, which 



is hemispherical. 



Styhpappus * graiidiflorus; nearly smooth, except the base of the stem, which 

 is lanuginous; leaves lyrately pinnatifid, the terminal segment large and ob- 

 long-lanceolate; scape robust and grooved, bracteolate; involucrum hemispheri- 

 cal; caliculum squarrose, of many series of ovate, pubescent, toothed leaves; 

 sepals linear-sublanceolate and smooth. 



Hab. High plains of the Wahlamet. A veiy stout species, the capituhtm larger than that of the 

 Dandelion, containing very many flowers. Scape twelve to fourteen inches high, nearly' as thick 

 as a goose-quill, grooved. Leaves eight or nine inches long, very irregularly divided, attenuated 

 into long petioles. The flower not seen. An external row of abortive achenia, nearly without 

 striatures, and smooth; fertile achenium linear-lanceolate, narrow and acutely ten-ribbed, pale brown, 

 the filiform stipe more than twice its length. Leaves often pubescent beneath, the inner surface of 

 the broad leaves of the caliculum tomentose. 



§1. II. Involucrum campanulaie; divisions of the involucrum similar, the outer 

 leafy and somewhat squarrose. — Troxtmeria. 



Stylopappus *laciniatus; smooth or pubescent; leaves very irregularly and 

 often deeply pinnatifid, the segments long and linear; scape naked, smooth; 

 involucrum campanulate; leaves of the caliculum lanceolate, somewhat squar- 

 rose; stipe more than twice the length of the achenium, slenderly filiform. /5. 

 * longifolius; more pubescent, leaves very long and deeply divided; the calicu- 

 lum leaf-like, longer than the involucrum, spreading, sometimes proliferous 

 into true leaves. 



