AND GENERA OF PLANTS. 441 



Leucoseris? Californicus. Hieracium? Californicum, Decand., Vol. VII., p. 

 235. From the remark that "the pappus is white, fragile, and in a single 

 series," I conjecture this may be a species of the present genus. The author 

 also imagines that it may belong to a new genus. The flowers have probably 

 been white, as he says they are purplish beneath. — Collected in Upper Califor- 

 nia by Mr. Douglas. It is described as smooth, with the stem erect, striated, 

 the summit paniculate, the branches bracteolate and monocephalous; the 

 leaves sessile, sublanceolate-linear, acuminate, entire; the scales of the involu- 

 crum linear and imbricated. The mature fruit was not seen. 



Obs. This genus, nearly allied to Andryala, is distinguished by the free leaves 

 of the involucrum, which are not at all ingrafted ; by the presence of a copious, 

 imbricated involucellum ; a convex receptacle, wholly naked; a pentangular 

 achenium, white flowers, and a pubescence which is not stellated or glandular. 

 On the other hand, the mode of growth is similar, the form of the involucrum, 

 as well as the singular character of the pappus, and general form and striatures 

 of the fruit. Under A. C}ieira7ithifolia, L'Heritier has well described the 

 pappus of that species as pilose and pubescent at the base: the rays are about 

 eighteen. 



o 



Subtribe viii. Hieracie^. (Lessing.) 



MULGEDIUM. (Cassini.) 



t Flowers blue, the substance of the achenium attenuated into a long point. 



Mulgedium pulchellum. Sonchus pulchellus, Pursh. Lactuca integrifolia, 

 NuTT. Gen. Am., Vol. II., p. 124. Lactuca pulchella, Decand., Vol. VII.,* 

 p. 134. 



Mulgedium * lieterophyllum; leaves linear-lanceolate or oblong-lanceolate, the 

 lower ones often runcinately pinnatifid or toothed towards the base ; panicle 

 divaricate, squamose; involucrum conic-ovate, the segments lanceolate in three 

 or four series, and very unequal; flowers blue; achenium with a distinct ros- 

 trum, of the same substance with the striated achenium. Sonchus Sibiricus, 

 Hooker, Flor. Bor. Am., Vol. I., p. 293, not of Linn. 



Hab. Lake Huron, and Canada, to latitude 66°. (Hooker.) On the Rocky Mountain plains, 

 and the banks of the Oregon, in the interior. Entirely unlike M. Sibiricum, which is annual; 

 VII. — 5 L 



