COMPOSITE. (COMPOSITE FAMILY.) 151 



linear-lanceolate, 2 inches long and 2 lines wide, obscurely if at all 3-nerved ; 

 the narrowest almost filiform, at least when dry, and margins involute : invo- 

 lucre thin-chartaceous when dry : corolla-lobes or teeth short, from lanceolate 

 to nearly ovate : akenes linear : pappus sojl. Proc. Am. Acad. viii. 644. 

 From New Mexico and S. California to Dakota and British Columbia. An 

 exceedingly polymorphous species, the following varieties representing the 

 principal forms within our range. 



Var. glabrata, Gray. Includes forms with the usually narrow leaves 

 early glabrate or perhaps glabrous from the first, sometimes balsamic, some- 

 times not. Not rare in Colorado, where even the branches sometimes early 

 lose their light tomentum. 



Var. albicaulis, Gray. Branches for the most part permanently and 

 very densely white-tomentose and leaves floccose-tomentose : involucre either 

 tomentulose or glabrate ; its bracts commonly acutish : corolla-lobes more or 

 less lanceolate and the tube villous-pubescent. Mountains of Wyoming to 

 British Columbia ; also in California. 



Var. latisquamea, Gray. Rather stout, white-tomentose or partly gla- 

 brate : heads numerous in the corymbiform cymes : bracts of the glabrous 

 involucre mostly elliptical-oblong, very obtuse : lobes or teeth of the corolla 

 short, someAvhat lanceolate, the tube glabrous. S. E. Colorado to New 

 Mexico and S. Utah. 



9. B. Dotlglasii, Gray. Green, no tomentum: from 6 inches to 6 feet 

 }\']gh,fastigiately branched, sometimes resinous-viscid, often slightly or not at all 

 so: leaves from very narrowly linear or almost filiform (but plane) to lanceo- 

 late-oblong, mostly 3-nerved : heads few or numerous and fasti giate-cymose : 

 bracts of the involucre comparatively few, only 2 to 4 in each vertical rank, 

 from broadly to linear-oblong or lanceolate, obtuse, Jirm-chartaceous : pappus 

 rigiduJous. From Dakota to Washington Territory and southward into 

 California and New Mexico. Very variable, with the following principal 

 forms. 



Var. pumila, Gray. A dwarf northern and mountain state, a span or 

 two high, glabrous or minutely puberulent and disposed to be viscidulous ; the 

 simple branches bearing very few heads in a close cluster : outer involucral 

 bracts either somewhat greenish-tipped or passing into bract-like leaves. N. 

 Montana to Washington Territory and mountains of Utah. 



Var. serrulata, Gray. Taller : leaves linear or narrowly lanceolate, ser- 

 rulate-ciliolate, sometimes scabrous and rigid. Common through the whole 

 dry interior region. 



Var. tortifolia, Gray. Leaves twisted : otherwise like the preceding. 

 Plains of Colorado to California. 



Var. lanceolata, Gray. Low, but bearing compact cymes of numerous 

 (5 to 7-flowered) heads: leaves short, lanceolate or broadly linear, puberu- 

 leut. Synopt. Fl. i. 140. 



H- t- (- Akenes and ovaries glabrous, nearly terete : bracts of the involucre 

 rounded-obtuse : suffrutescent, green and glabrous. 



10. B. Vaseyi, Gray. A span or two high, somewhat balsamic-viscid, 

 leafy up to the fastigiate-cymose cluster of heads : leaves linear or spatulate- 

 linear, obtuse, plane : involucre 3 or 4 lines long ; its bracts narrowly oblong, 



