THISTLE FAMILY 975 



4. P. vitifolia Greene. Leaf-blades broadly cordate or deltoid-rcniform, 

 5-12 cm. long, 8-20 cm. broad, with two or more lateral veins rising from the 

 base, usually 5-lobed, the basal lobes usually deeply 2-cleft and the terminal one 

 3-5-lobed; lobes coarsely dentate; scape 2-3 dm. high; involucres over 1 cm. high, 

 glandular and fioccose; ligules of the substerile heads about 7 mm. long and 1.5 

 mm. wide. Wet places: Man, — Alta. Boreal, Je-Jl. 



6. P. palmata (Ait.) A. Gray. 



g, 10-30 cm. wide, snarinerlv viUoi 



5-15 



lobed; lobes oblanceolate, coarsely few-toothed, with broadly triangular, mucro- 

 nate teeth; scape stout, 1.5-6 dm. high; heads corymbose; involucres about 1 

 cm. liigh, somewhat glandular-pubescent, tomentulose at the base; ligules of the 

 substerile heads about 5 mm, long, 1 mm. M^ide, those of the fertile heads 2.5-3 

 mm. long, 0.5 mm. wide. Boggy places: Newf. — N.Y. — Minn. — Alta. Plain — 

 Boreal. Je-Au. 



125. CROCIDIUM Hook. 



Small winter annuals. Leaves alternate. Heads radiate. Involucre hemi- 

 spheric; bracts 8-12, equal, oblong. Ray-flowers about 12, pistillate, fertile; 

 ligules yellow. Disk-flowers hermaphrodite, fertile; corollas j'cUow, with slender 

 tube, campanulate throat, and 5-toothed limb. Anthers with deltoid-ovate tips. 

 Style-branches short and broad, with deltoid appendages. Achenes fusiform, 

 obscurely 3-5-ribbed, papillate. Pappus of a single series of white barbellate 

 bristles, or in the ray-flowers wanting. 



1, C. multicaule Hook. Stems several from the base, 1-2 dm. high, shghtly 

 fioccose when young; basal leaves tufted, obovate or spatulate, sessile or short- 

 petioled, few-toothed, 2-5 cm. long; stem-leaves linear, entire or the lower denticu- 

 late; involucres 7-8 mm. broad, hemispheric; bracts lance-ovate, acute; flowers 

 golden yellow; ligules 5-8 mm. long; achenes ovoid, angled, scurfy. Plains and 

 hills: B.C.— Ida.— Cahf. Son. Mr-My. 



126. PSATHYROTHES A. Gray. Velvet-rosettes. 



Low pubescent or scurfy, winter annuals. Leaves petioled, wnth broad 

 blades. Heads discoid. Involucres hemispheric; bracts in 2 series, at least the 

 outer herbaceous; receptacle flat. Flowers all hermaphrodite and fertile; corolla 

 with a very short tube, cylindric throat and short obtuse teeth, woolly at the 

 summit. Style-branches flat, obtuse or trimcate, with obscure appendages. 

 Achenes terete, turbinate-villous or hirsute. Pappus of numerous stiff, ferrugin- 

 ous bristles. 



Leaves not beset with long hairs. , . . 



Outer bracts obovate. larger than the inner; spreadmg tomentum long-villou5. 



1. P. ramosissima. 



Outer bracts oblong, not longer than the inner, erect; tomentum fine, furfuraceous. 



2. P. annua. 



Leaves with scattered long-jointed hairs. 3. P. pUifera. 



1. P. ramosissima (Torr.) A. Gray. Stem branched from the base, scurfy- 

 tomentose; branches decumbent, 8-12 cm. high; leaf-blades rounded, subcor- 

 date or cuneate at the base, 1-2 cm. broad, scurfy-tomentose, crenate; head 

 solitary, axillary; involucres 5-6 mm. high; flowers yellow; achenes short-turbin- 

 ate, densely long-villous. Gravelly hills: Ariz. — s Utah — Xev.~^ Cahf.; L. 

 Cahf. L, Son. Ap-My. 



2. P. annua (Xutt.) A. Gray. Stem branched from the base, 5-12 em. 

 high scurfy-tomentose; leaf-blades orbicular or roimded-ovate; cuneate at the 

 base' coarsely dentate, 1 cm. broad or less; heads sohtary, axillary, short-i>e- 

 duncled- involucres 5-7 mm. high; corollas pale yellow, sometimes changmg mto 

 purplish; achenes oblong-turbinate, densely villous. Saline plams: Ariz.— s Utah 

 — Nev.— s Calif. Son, :My-Au. 



3. P pilifera A. Gray, Stem branched from the base, scurfy-tomentose, 

 5-15* cm' high' leaf-blades rhombic-obovate or subrotund, with cuneate ba^, 

 orifir,^ «piirfv-tnmftntosfi and hksute-ciUate on the margins and petioles; heads 



