322 DESCRIPTIONS OF NEW SPECIES 



Hab. On the sand and gravel bars of the Oregon and its tributary streams ; common. Flower- 

 ing in August. Many stems from the same root, about a foot high, more or less hirsute ; the 

 leaves nearly smooth, scabrous on the margin, oblong, acute, sessile, rather numerous ; flowers in 

 an irregular, paniculate corymb, very inconspicuous, of a pale yellow, the florets nearly hid in the 

 pappus, which is white and very slender, as in Inula. Achenia almost fusiform. Scales of the 

 involucrum lanceolate, acute, in about four series. Florets fifty, or more. The whole plant pos- 

 sesses a heavy aromatic odour. 



*MACRONEMA.t 



Capitulum heterogamous, or homogamous, many-flowered, rays few or none, fe- 

 minine, often with the rudiments of stamina; florets of the disk tubular-cam- 

 panulate, five-cleft at the apex. Branches of the style very long, equally 

 filiform, exserted, acute, and hirsute. Involucrum subimbricate in two 

 nearly equal series, the inner rigid and membranaceous on the margin, the 

 outer bracteolate or foliaceous. Receptaculum alveolate. Achenium linear- 

 oblong, compressed, very long, obscurely striate, smooth or pubescent. Pap- 

 pus pilose, copious, scabrous, unequal. — Low, viscidly pubescent shrubs, 

 with many stems and much branched; branches one-flowered, fastigiate; 

 rays and disk yellow; leaves alternate, entire. — Allied to Aplopappus, though 

 remotely, having a different pappus and involucrum, &c. 



Macronema * suffruticosa; minutely and viscidly pubescent, leaves oblong- 

 linear, acute, numerous, rays six to eight. 



Hab. On the sandy and gravelly banks of the Malade, a stream of the Oregon, near the Blue 

 Mountains. A rather elegant low shrub, woody towards the base, about six to eight inches high, 

 sending up numerous slender, simple, mostly one-flowered branches, from the summit of the low, 

 woody stem ; leaves about one to one and a half inches long, by about two lines wide, rather 

 crowded. Capitulum large and hemispherical, containing thirty or more florets, with about eight 

 linear-oblong, three-toothed rays, having often the same pubescent stigmas with the discal florets, 

 and not unfrequently the rudiments of stamens. Pappus fulvous, exserted beyond the short invo- 

 lucrum, nearly as long as the florets, yet not longerthan the elongated achenhim. Stigmas ex- 

 ceedingly long, almost as in the Enpatoriums, sometimes trifid. 



§ *EuGYMNA. — Flowers discoid, achenium glabrous. 



Macronema ^discoidea; glandular pubescent, shrubby; young branches to- 

 mentose, leaves cuneate-oblong, obtuse; rays none, achenia smooth. 



t In allusion to the long filiform styles, (ftaxpof, long, and vt}(ia, a thread.) 



