COMPOSITiE. (composite FAMILY.) 151 



linear-lanceolate, 2 inches long and 2 Wnes v.- n\e, ohsntrelij if at all 3-nerved ; 

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

 lucre thin-cliaiiaceous when dry : corolla-lol)es or teeth sliort, from huiceohite 

 to nearly ovate: akenes linear: paj)pus sojl. — I'roc. Am. Aca<l. viii. 644. 

 From New Mexico and S. California to the Dakotas and liritish f'uliimliia. 

 An exceedingly polymorphous species, the following varieties representing 

 the jtriiicipal forms witiiin our range. 



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

 early glabrate or perhaps glabrous from the first, sometimes l)alsamir, some- 

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

 lose tlicir liglit tomeutum. 



Var. albicaulis, Gray. Branches for tlie mo!<t ])art ]termaneiitly and 

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

 tomentulose or glabrate ; its bracts commonly acutish : corolla-l»tl»es more or 

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

 Britisli 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 condla 

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

 Mexico and S. Utah. 



9. B. Douglasii, Gray. Green, no tomentiim: from 6 inches to 6 feet 

 h\g\\,/hsf/(/iat('/f/ branched, sometimes resinons-visrid, often slightly or not at all 

 so. leaves from very narrowly linear or almost filiform {hut plane) to lanceo- 

 late-oblong, v/uw//// 3-?2(?rre<'/ : heads few or numennis and fastigiate-cym«)se : 

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

 from broadly to linear-oblong or lanceolate, obtuse, Jirm-chartaceons : jiajtjtus 

 rigidulous. — From the Dakotas to Washington and southward into Cal- 

 ifornia 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 and mountains of Utah. 



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

 rulate-cili(date, sometimes scabrous and rigid. — Common through the whole 

 dry interior region. 



\'ar. tortifolia, Gray. Leaves twisted : otiierwise like the ])receding. — 

 Plains of Colorado to California. 



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

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

 lent. — Synopt. Fl. i. 140. 



•+--!--»- Akenes and ovaries glabrous, nearli/ terete: hrarfs of t lie involucre 

 rounded-obtuse : sujj'rutescent, guen and ghdirous. 



10. B. Vaseyi, Gray. A span or two high, somewhat bal.^amic-vi.-sciil. 

 leafy up to the fastigiate-cymose du.ster of heads: leaves linear or sj)atulate 

 linear, obtuse, jdaiie : involucre 3 or 4 lines long; its bracts n;irrowIy obl»»ni: 



