LiNOSTRis. COMPOSITE. 235 



hirsute ; leaves linear-lanceolate, denticulate-ciliate, mucronulate-acute ; 

 heads axillary and terminal ; scales of the glabrous involucre linear; the ex- 

 terior larger and foliaceous. Hook. I. c. 



Banks of the Saskatchawan, Drummond. — Plant 3-4 inches high, of 

 doubtful genus. 



42. AMMODIA. Nutt. in trans Amer. phil. soc. {n. scr.) 7. p. 321. 



Heads many-flowered ; the flowers all perfect and tubular. Scales of 

 the campanulate involucre scarious-membranaceous, linear or lanceolate, 

 1-nerved, imbricated in few series ; the innermost as long as the disk, the 

 outermost short, appressed. Receptacle flat, alveolate-toothed. Branches of 

 the style subulate-filiform, the appendages longer than the flat stigmatic por- 

 tion. Achenia oblong-linear, attenuate, fusiform, or somewhat compressed, 

 pubescent. Pappus of copious minutely scabrous capillary bristles. — A 

 perennial branching somewhat hairy herb, with the habit and appearance of 

 Inula viscosa ! exhaling a heavy odor. Leaves alternate, oblong, entire, 

 veiny, sessile. Heads irregularly paniculate-corymbose : peduncles some- 

 what glandular; the pale yellow flowers nearly hid in the copious white 

 pappus. 



A. Oregana (Nutt. ! 1. c.) 



On the sand and gravel bars of the Oregon and its tributaries, common, 

 Nuttall ! Aug. — Stems a foot high, many from the same root. Heads as 

 large as in Inula viscosa. Flowers all similar ; the corolla slender, slightly 

 dilated upwards, 5-toothed. Anthers not caudate. 



43. MACRONEMA. Nutt. in trans. Amer. phil. soc. {n. ser.) 7. p. 322. 



Heads many-flowered ; the ray -flowers 6-8, ligulate, pistillate, or none ; 

 those of the disk tubular, perfect. Scales of the involucre, few, loose, some- 

 what in 2 series, nearly equal, linear-lanceolate, 1-nerved ; the exterior 

 mostly with foliaceous spreading tips, commonly with one or more foliaceous 

 bracts at the base resembling the upper leaves. Receptacle flat, areolate. 

 Corolla of the disk somewhat dilated above, 5-toothed. Branches of the 

 style much exserted ; the appendages of the style (in the disk-flowers) elon- 

 gated, subulate, hirsute, much longer than the linear flat stigmatic portion. 

 Achenia large, much compressed, when mature longer than the pappus of 

 copious somewhat unequal scabrous capillary bristles. — Low and viscidly 

 pubescent much branched shrubby plants (natives of Oregon) ; the fastigiate 

 leafy branches terminated by solitary rather large heads. Leaves alternate, 

 lanceolate, entire, sessile. Flowers yellow. 



§ 1. Heads radiate : achenia p)uhescent. 



1. M. svjfruticosa (Nutt. ! 1. c.) : leaves oblong-linear or lanceolate, acute, 

 somewhat narrowed towards the base ; scales of tlie involucre mostly appen- 

 diculate ; achenia oblong or sliglitly obovate, flat, 1-3-nerved on each side. 



Sandy and gravelly banks of the Malade, a stream of the Oregon, near 



