3G-1 FLORA OF TEXAS. 



abruptly narrowed into a filiform beak ; pappus of copious 

 soft white hairs. — Tall herbs, with entire or pinnatifid 

 leaves ; heads paniculate ; flowers white, purple, blue, or 

 yellow. 



L. ELONGATA, Muhl. Smootli or nearly so ; stem tall 

 (4:°-8°), simple or paniculate; leaves elongated, lanceolate, 

 sessile or partly clasping, the upper ones mostly entire, the 

 lower pinnatifid; panicle long, leafless; floivers yellow. 

 — Yar. INTEGRIFOLIA. Leaves all undivided, or the lowest 

 pinnatifid ; floivers yellow or purplish. — Yar. graminifolia. 

 Smaller (2°-3°) ; leaves linear or linear-lanceolate, rather 

 rigid, all entire, or the lowest ones sparingly toothed or 

 pinnatifid ; floivers purple. 



MULGEDIUM, Cass. 



Heads many-flowered ; scales of the involucre imbricated, 

 the outer ones short ; receptacle naked ; achenia smooth, 

 laterally compressed, narrowed into a short beak, which is 

 expanded into a ciliate disk at the apex ; pappus of copious 

 white or tawny hairs. — Tall herbs j leaves pinnatifid or un- 

 divided ; floivers mostly blue. 



* Pappus tawny. 



M. leucoph^um:, DC. Smoothish ; stem panicled above ; 

 leaves numerous, irregularly pinnatifid, with coarsely- 

 toothed lobes, the terminal lobe 3-angled, or in the upper 

 leaves often linear and entire ; racemes panicled. Stem 

 3°-12° high; leaves 6-12' long; floivers pale blue. 



SONCHUS, L. 



Heads many-flowered; scales of the involucre imbri- 

 cated ; recejjtacle naked ; achenia compressed, ribbed, not 

 beaked nor narrowed at the apex; pappus of copious soft 

 white hairs. Annuals. Xe^ res entire or pinnatifid ; heads 

 somewhat umbelled ; flowers yellow. 



