48 CALIFORNIA ACADEiVIY OF SCIENCES. 



CALAIS, DC. sens, restr- 



Involucre conical, scarcely calyculate, bracts imbricate, 

 the outer successively shorter, all thin and scarious-mar- 

 gined. Receptacle flat, centrally more or less alveolate- 

 chaffy. Akenes terete, 8 — 10 costate, the basal callosity not 

 enlarged. Pale^e of the pappus 5, elongated, flat, bifid at 

 apex and short-awned. — Subaculescent annuals, all West 

 North American, with laciniately-lobed or pinnatifid leaves, 

 and erect heads, on strict, erect peduncles which are fistu- 

 lous-thickened above. Akenes all alike, glabrous, with scab- 

 rous cost 83. Palese of the pappus glabrous and more or 

 less denticulate. Genus of few species but of wider range 

 than the last, the typical species occurring eastward to the 

 borders of Colorado and Texas, and on the Pacific shores, 

 from British Columbia to the island of Guadalupe . Calais 

 § Galocalais DC. Prod. vii. 85; Torr. & Gray, Fl. N. Am. ii. 

 471; Gray, Pac. R. Rep. iv. 112. Species of Ificroseris, 

 Gray, Proc. Am. Acad, ix, Bot. Cal. i. and Syn. Fl. ii. 



^Palce bright, ivhite, soft, deciduous from the nearly black akenes. 



C. LINEARIFOLIA, DC, Prod. 1. c.— Species of the widest 

 range, and of much variability as regards the height of the 

 stem and the number of flowers in each head. Sometimes 

 nearly acaulescent, and with very large heads; but around 

 San Diego the stem is slender and often more than a foot 

 high, the heads being few-flowered; but the bright pappus, 

 promptly deciduous from the mature, almost rostrate-atten- 

 uate, black akenes readily distingaishes the species in all 

 its forms, whether on Guadalupe or in New Mexico, Wash- 

 ington Territory, or California. 



"^"^Palece brownish, of firm texture, persistent on the light 

 colored akenes. 



-\-~ Awn of pappus shorter than the palea. 



0. LiNDLEYi, DC. — Glabrous, a foot or two high: akenes 

 5 — 6 lines long, slightly attenuate toward the summit; palea 



