864 CARDUACEAE 



trumpet-shaped, deeply 5-lobed. Anthers obtuse at the base. Style-branches 

 stigmatic their whole length, with ovate to lanceolate-subulate appendages. 

 Achenes densely silvery-villous. Pappus of white capillary bristles, rather de- 

 ciduous. 



1. S. interior (Coville) Rydb. Shrub 3-10 dm. high; branches green, slightly 

 puberulent; leaves linear, fleshy, glandular-pimctate, 1-2 cm. long; involucres 

 hemispheric, about 1 cm. high; bracts linear, attenuate, glandular-granuliferous; 

 hgules 9-11 mm. long, golden yellow. _ Aplopappus interior Coville. Hillsides 

 m desert regions: s Calif. — s Utah — Ariz. Son. Ap-Jl. 



20. OONOPSIS Greene. 



Perennial herbs with woody caudex or crown, and erect, leafy stems. Leaves 

 hnear or lanceolate, entire. Heads in terminal cymes or solitary. Involucres 

 campanulate or hemispheric; bracts well imbricate, flat, cuspidate-acuminate. 

 Ray-flowers pistillate or wanting; ligules yellow. Disk-corollas yellow, cylindric, 

 with 5 short teeth. Tips of the style-branches ovate, shorter than the stigmatic 

 part. Achenes glabrous or strigose, many-nerved. Pappus of rather few coarse 

 bristles. 



Dwarf; stem less than 1 dm. high; heads 6-10 mm. high. 

 Plant more or less villous; leaves flat; heads radiate. 



Heads 6-8 mm. high; leaves 1-3 cm. long, not exceeding the stem. 



TT J o -^ , . , , 1. O. muUicaulis. 



Heads 8-10 nun. high; leaves 4-8 cm. long, often overtopping the stem. 



-r»i , , , , , , 2. O. argillacea. 



Plant glabroiis; leaves involute; heads discoid. 3. O. Enaelmannii 



Plant robust, 1.5-3 dm. lugh; heads 15-20 mm. high. 

 Heads discoid. 



Heads clustered, 10-15 mm. high; achenes glabrous. 4. O. Wardii. 



Heads soUtary, 15 mm. higli or more; achenes glandular. 5. O. monocephala. 



Heads radiate. 6, O. foliosa. 



1. O. multicaulis (Nutt.) Greene. Stems several, 1 dm. high or less, 

 slightly villous; leaves narrowly linear, 1-3 cm. long, slightly villous, thick; 

 heads cor>'mbose; involucres turbinate; bracts ovate, lanceolate or oblong, cus- 

 pidate-acuminate; ligules 5-6, 4-5 mm. long. Aplopappus mulHcatdis A. Gray. 

 Rocks: Wyo. SuhmonL 



2. O. argillacea A. Nels. Stems numerous, 5-8 cm. long, sparingly villous; 

 leaves entire, narrowly-linear, acute; Involucres slightlv villous, turbinate; bracts 

 oblong-ovate or lanceolate, acuminate; rays about iO; Hgules 5-6 mm. long. 

 Clayey slopes: Wyo. SvbrnonL Je-Jl. 



3. O. Engelmannii (A. Gray) Greene. Stems 1-2 dm. high, glabrous, leafy; 

 leaves narrowly linear, 3-5 cm. long, 2-3 mm. wide, rigid; heads rather many, in 

 a congested c^me, about 12 mm. high; involucres turbinate-campanulate, shorter 

 than the disk-flowers; bracts ovate or elliptic, short-cuspidate. Bigdovia Engel- 

 mannii A. Gray. Dry plains: Colo. — Kans. Plain, Au-0. 



Wardii 



Stems 1-2.5 dm. high, very lej 

 or 3-nerved at the base, 6-12 

 15-25 



nate. A. Fremontii Wardii A. Gray. O. condensata A. Nels. Plains* Wvo 

 SuhmonL Jl-S. • ^ • 



6. O. monocephala A. Nels. Stems erect or ascending, 1-2 dm high leafv 

 to the summit; leaves glabrous, linear-oblong, sessile, acute, 5^^ cm. long/about 

 1 cm. broad; bracts oWong, abruptly acuminate, glabrous or ciliate on the mar- 

 gins. Plains: Colo. Plain. 



6. O. foliosa (A, Gray) Greene. Stems 2-3 dm. high, very leafy, glabrous; 

 leaves lanceolate or oblong-lanceolate, 3-5-nerved, 5-10 cm. long; heads solitarv 

 or few together; involucres 15-20 mm. high; bracts glabrous, broadly lanceolate, 

 acuminate; rays 12-15 mm. long; achenes glandular-puberulent. Aplopappus 

 Fremonh A. Gray, Plains and rocky hills: Kans.— Colo. Suhmont Je-S 



