KuHNiA. COMPOSITiE. 79 



be necessary'' if more than one species were admitted. But, considerable as 

 is the difference lietween ihe extremes, we have a great variety of specimens 

 forming snch complete transitions that we are unable even to characierize a 

 series of varieties. The involucre, corolla, achenia, dec. are precisely the 

 same in all. We have, therefore, taken the more common northern plant as 

 the type of the species, and have designated the extreme forms as varieties. 



14. BULBOSTYLIS. DC. prodr. 5. p. 138. 



Heads 10-25-flowered. Scales of the oblong or cylindrical-campanulale 

 involucre rather loosely imbricated in about 3 series, striate ; the exterior 

 short, the inner lanceolate or linear. Receptacle narrow, naked. Corolla 

 tubular, slender, somewhat dilated at the base, contracted at the summit, 

 with 5 extremely short externally glandular teeth. Style whh a commonly 

 villous bulb at the base, included. Achenia nearly terete, or obscurely 

 6-angled, about 10-striate. Pappus of numerous capillary scabrous bristles, 

 longer tlian the corolla. — Suflfruticose (chiefly Mexican) plants, with terete 

 branches. Leaves opposite or alternate, ovate or lanceolate, petioled, ser- 

 rate, often doited with resinous globules. Heads in thyrsoid or spicate leafy 

 panicles. Flowers mostly white or ochroleucous. 



Perhaps not sufficiently distinct from Brickellia; which again is distinguished 

 froiTi Eupatorium chiefly by its striate achenia. 



1. B. Californica: stem and branches velvety-puberulent ; leaves ovate, on 

 short petioles, irregularly serrate-toothed, 3-nerved at the base, nearly gla- 

 brous above, dotted with minute glands and puberulent but scarcely reticulated 

 beneath, the upper ones mostly alternate; heads in a spicate thyrsus, about 

 20-flo\vered ; scales of the involucre obtuse ; the exterior very short, ap- 

 pressed ; the innermost linear, 1— 2-nerved; achenia minutely pubescent. — 

 B. Cavanillesii, DC. ! prodr. 5. ;;. 138, partly (the Californian plant) ; Hook. 

 Sf Arn. ! hot. Beechey, suppl. p. 3o0. 



California, i)oy^/a6'.' — DiHers from the Mexican plant {herb. DC. .') as 

 well in the leaves, which have not the upper surface scabrous, nor the lower 

 reticulated, as in the obtuse scales of the involucre. 



2. B. microphylla (Nutt.) : much branched, viscidly pubescent and glandu- 

 lar ; leaves alternate, ovate, petioled, sparingly toothed, tripli-nerved, equally 

 pubescent and viscid on both sides ; those of the branchlets very small, 

 nearly sessile; heads about 15-flowered ; exterior scales of the involucre 

 with squarrose foliaceous tips; the interior erect, linear, 2-3-nerved, mucro- 

 nulate. — Nutt..' in trans. Amer. jihii. soc. {n. scr.) 7. p. 287. 



Oregon, on the Walla-wallah, Nultall ! — A low suffruticose plant; the 

 leaves of the numerous branchlets onl}' 2 or 3 lines long, rather thick, re- 

 sembling those of some Asters. Heads small, scattered. Achenia not seen. 



15. BRICKELLIA. Ell. sk. 2. p. 290. 



Heads 30-50-flowered. Scales of the campanulate involucre imbricated, 

 lanceolate or linear, striate ; the exterior shorter. Receptacle naked, flat. 

 Corolla tubular, slightly expanded towards the summit ; the teeth short, ob- 

 tuse, scarcely glandular externally. Style whh a villous bulb at the base ; 

 the branches often much exsertcd, somewhat clavate, glabrous. Achenia 



