1895.] NATURAL SCIENCES OF PHILADELPHIA. 547 



Trifolium lilaoinum. 



Annual, flaccid, the erect or merely decumbent branches 6 to 10 

 inches high : herbage apparently glabrous, but the growing parts 

 more or less hirsutulous under a lens: lowest leaflets obovate, the 

 upper oblong, or elliptic-lanceolate, minutely spinulose-serrulate : 

 peduncles elongated, far surpassing the leaves and somewhat scapi- 

 form : hemispherical and amply involucrate heads £ inch broad; 

 involucre of 8 or 10 obovate broad and somewhat overlapping 

 laciniately cleft lobes; subulate-setaceous and plumose calyx- teeth 

 about as long as the campanulate thin and scarious 5-nerved tube : 

 corolla | inch long, of a rich deep lilac- purple tipped with pink or 

 white. 



A most beautiful ally of T. barbigemm, and of apparently quite 

 limited range; but it is common on the lower slopes of one or two 

 hills at South San Francisco. Cab, and has been collected once by 

 Mr. Bioletti and once by myself on the eastern side of the bay still 

 further southward. 



Trifolium rostratum. 



Annual, glabrous, very slender, diffuse, dwarf, the branches only 

 2 or 3 inches long : stipules rounded, spreading, laciuiate : very 

 slender petioles elongated; leaflets cuueate-obcordate, only ! inch 

 long, evenly and acutely serrate-toothed : peduncles exceeding the 

 leaves; involucre small but manifest, about 4 or 5 lines wide, lobed and 

 laciniate : head less than ■*. inch broad, rather few-flowered : calyx- 

 teeth longer than the subcampanulate tube, oblong-ovate, tapering 

 to a rigid aristiform apex : corolla purple, tipped with white, the 

 keel with a long beak-like apex at least a third as long as the body. 



A species of quite remarkable floral structure, collected only by 

 Mr. V. K. Chestnut, at Lake Merritt, Oakland, California, 1889; 

 at that time referred hy me (Fl. Fr., HO), with much hesitation, to 

 T. appendiculatum . 



Boisduvalia diffusa. 



Much branched from the base, the slender, wiry, white and shin- 

 ing sparingly leafy branches 8 to 12 inches long, very decumbent or 

 almost prostrate, and, with the leaves, sparsely hirtellous when 

 young, mostly glabrate in age: the scattered leaves, ovate and 

 oblong-ovate, and ovate-lanceolate, ! to i inch long, all sessile, and 

 all, even the lowest as well as the uppermost, with a flower in the 

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