186 COMPOSITE. 



whole herbage white with a persistent wool, not at all glandular or heavy- 

 scented: leaves linear, or the lower spatulate, with slenderly decumbent 

 base: involucres small, ovate, bright white; bracts ovate or oblong, 

 obtuse. — Hillsides. Aug. — Oct. 



3. G. Chilense, Spreng. Annual and biennial, stoutish, 1 — 2% ft. 

 high, cymose-corymbose at summit: leaves lanceolate, more thinly floccose 

 than in the last, the short decumbent leaves rather broad: involucre 

 hemispherical, with a greenish-yellowish tinge; bracts thin, oval or 

 oblong, obtuse. Var. eonfertifolia. Very stout and low : leaves linear, 

 densely clothing the stem up to the sessile dense cluster of heads. — Very 

 common and variable; the variety biennial; both flowering at almost all 

 seasons. 



4. G. Californicum, DO. Stoutish, 2—3 ft. high, biennial, the leaves 

 diminishing in size towards the broad cymose terminal loose cluster of 

 large rather dull white heads: leaves lanceolate, glabrate above, glandular 

 and balsamic-scented, very obviously adnale-decurrenl: outer bracts of 

 the involucre ovate or oblong, the inner acute. — Common on dry hills in 

 places partly shaded. 



5. G. ramosissimum, Nutt. Biennial, erect, 3—5 ft. high, the fastig- 

 iate panicle often 2 ft. long and more, of small reddish heads: leaves green 

 and glandular on both faces, linear, decurrent, the herbage very sweet- 

 scented: heads only 2 lines high: involucral bracts rather few, oblong- 

 lanceolate, acutish. — Wooded hills; late-flowering. Sept. — Nov. 



■m- ++ Involucres deeply embedded in loose wool. 



6. G. palnstre, Nutt. Low branching annual, floccose with long 

 wool : leaves spatulate to oblong and lanceolate : heads glomerate, leaf y- 

 bracted, a line high : tips of linear involucral bracts white, obtuse. — In 

 low moist lands. May — Aug. 



* * Pappus-bristles united at base, deciduous in a ring. 



7. G. purpurenm, L. Biennial, simple or branching, erect or 

 decumbent, 6 — 10 in. high, canescent with a dense coating of close wool: 

 leaves spatulate, obtuse, usually becoming glabrate and green above: 

 heads crowded in an elongated more or less interrupted spiciform 

 inflorescence: involucre brownish: achenes sparsely scabrous. — In open 

 grounds. March — May. 



27. ADEXOCAULO\, Hook. Perennial, with alternate dilated leaves 

 on long margined petioles; the slender stem naked and paniculate above, 

 bearing small heads of whitish flowers; the peduncles beset with stalked 

 glands. Involucre of few thin-herbaceous bracts. Receptacle flat, 

 naked. Achenes ovoid-oblong or subclavate, far exceeding the involucre, 

 the upper part beset with stout stipitate glands. 



