OF ARTS AND SCIENCES : MAY 13, 1873. 585 



spike ; capsule clavate-obovate, strongly 8-ribbed, rigid, sessile. — 

 Xylopleurum, Spa'ch. 



17. CE. speciosa, Nutt. Stems from a perennial subterranean 

 rootstock, erect or ascending, or subdecumbent, \ — 2° high, branching ; 

 puberulent or canescently pubescent, rarely subvillous ; leaves oblong- 

 lanceolate to linear, 1-4' long, acute, attenuate at base, repand-denticu- 

 late, sinuate-dentate, or more or less deeply sinuate-pinnatifid, espe- 

 cially at base, or the lower lyrately pinnatifid ; calyx-tube rather thick, 

 4 - 8" long, a little exceeding the ovary ; petals f - \\' long, white or 

 rose-color, broadly obcordate or emarginate ; capsule 7 - 9" long, acute 

 above, attenuate below into a terete or subangled base of half its length, 

 nearly equally 8-costate by the thickened angles and prominent rihs ; 

 seeds very small, angled, scarcely tuberculate under a strong microscope. 

 — From Kansas to Southern Texas. 



18. CE. rosea, Ait. Biennial or perennial, puberulent ; stems as- 

 cending, 1-2° high, branching from the base ; leaves lanceolate, 1 — 2' 

 long, acute or acuminate, attenuate to a petiole, repandly denticulate or 

 entire, frequently sinuate-pinnatifid toward the base ; calyx-tube slen- 

 der, 2 - A" long, shorter than the ovary ; petals purple or rose-color, 

 abouj equalling the tube, rounded, entire ; capsule as in the last, but 

 seeds smoother. — From New Mexico and Arizona to Mexico ; Peru. 



* * * * Acaulescent or nearly so, mostly perennial ; flowers axillary, 

 erect in the bud, white or rose-color ; calyx-tube elongated, some, 

 what dilated at the throat ; capsule ovate or ovate-oblong, large 

 and rigid, obtusely tetragonal or sharply angled, mostly sessile ; 

 seeds large, horizontal. — Pachylophis (and Lavauxia in part), 

 Spach. 



19. CE. CiESPiTOSA, Nutt. Biennial or perennial, acaulescent or 

 with a suberect stem, 2-6' high, glabrous or more or less villous with 

 spreading, subscabrous hairs ; leaves oblong to narrowly lanceolate, 

 2-12' long, attenuate to a long petiole, acuminate or acute, sometimes 

 spatulate, irregularly sinuate-toothed or pinnatifid- or repand-denticu- 

 late ; calyx-tube 2-7' long, thick, 3 - 6" wide at the throat, the tips of 

 the segments not free in the bud ; petals broadly obcordate, £ - If 

 long ; capsules oblong, 1 - 2}/ long, 3 - 6" thick, subattenuate at each 

 end, sessile or short-pedicelled, strongly ribbed on the sides and often 

 with a double crest along the sutures ; seeds \\" long, in two rows in 

 each cell, oval-oblong, not angled, very minutely and densely tubercled 



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