CBEPIS COMPOSITE 399 



NABALUS 



in age, and bearing toward the base scattered eglandulose bristles : stems 

 rather slender, 10-20 inches high, solitary or rarely 2 from the same cau- 

 dex, bearing 1-5 heads leaves broadly lanceolate in outline, 4-6 inches long, 

 pinnately or bipinnately divided into linear-lanceolate lobes: peduncles 

 slender, usually 'hickened just below the Iliads: involucre 6-8 lines high ; 

 its bracts linear-lanceolate and barely acute, or the shorter ones acuminate : 

 achenes 4-6 lines long, fusiform, truncate at the apex, not costate, but 

 sometimes obscurely striate. Dry hillsides, eastern Oregon and Washing- 

 ton to Montana, Utah and Nevada. 



C. rostrata Coville 1. c. 564. Sparingly hirsute with glan Hess hairs, 

 and more or less tomentose : stems 4-15 inches high, 1-3 from each caudex, 

 striate-angled, bearing 1-3 heads : leaves oblong to broadly lanceolate in 

 outline, 4-6 inches long, pinnately parted into linear-lanceolate entire or 

 toothed lobes : involucre 6-8 lines high, more or less densely clothed with 

 long glandless white hairs : achenes 4-5 lines long, not costate the upper 

 part contracted into a distinct beak 1-2 lines long. Rocky hillsides, eas- 

 tern Oregon and Washington to Brit. Columbia. 



C. barbigera Leiberg, Coville 1. c. 565. Slightly tomentose with a 

 minute somewhat flocculent tomentum, not at all hirsute: stems several 

 from the crown of a thick perennial root, 1-2 feet high, sparingly leafy and 

 bearing an ample corymbose cyme of rather small heads : leaves broadly 

 lanceolate in outline, 4-10 inches long, runcinately toothed or deeply cut 

 into linear-lanceolate lobes : involucre 5-7 lines high, of linear, mostly ob- 

 tuse principal bracts and a few very small ovate or lanceolate acute ones at 

 base, all canescent-tomentose and more or less bristly with setaceous white 

 bristles. Dry ridges and rocky banks, eastern Oregon and Washington. 



107 NABALUS Cass. Diet. Nat. xxxiv, 94. 



Leafy-stemmed perennial, herbs with alternate dentate or pin- 

 natifid leaves, and usually numerous small mostly nodding heads 

 of white yellowish or purplish flowers. Involucre 5-30-flowered. 

 cylindric, usually narrow, unchanged in age, of 1 or 2 series of 

 equal bracts and a few calyculate ones at their base. Receptacle 

 flat, naked. Achenes terete or 4-5-angled, usually striate, some- 

 times striately pluricostate, truncate at summit. Pappus of 

 copious rather rigid capillary bristles. 



X. alatus Hook. Fl. i, 294, t. 102. Prenanthes alata Gray. Glabrous 

 or nearly so: stems 1-2 feet high, the larger plants branching: leaves 

 hastate-deltoid, acute or acuminate, sharply and irregularly dentate, ab- 

 ruptly contracted or some of the upper cuneately decurrent into a winged 

 petiole, or small uppermost narrow and sessile hy a tapering base : heads 

 loosely and somewhat corymbosely panicled: involucre campanulate-oh- 

 long, of 8-10 often livid bracts, nearly or quite destitute of scarious mar- 

 gins, imperfectly calyculate by 2 or 3 loose linear accessory ones, 5-15- 

 flowered: corollas purp ish : achenes slender, 3-4 lines long, at least 

 sometimes with tapering summit. On moist cliffs, Alaska to Oregon. 



108 LYGODESMIA Don Edinb. Phil. Journ. vi, 305. 



Smooth herbs with usually rush-like rigid or tough stems, 

 linear or scale-like leaves and terminal or scattered erect heads 

 of pink or rose-colored flowers. Heads 3-12-flowered. Involucre 

 cylindric, its principal bracts 5-8, linear, scarious-rnargined. 

 equal, slightly united at the base, with several very short outer 

 ones. Receptacle flat, naked. Achenes terete, obscurely striate 



