CHICORY FAMILY 1017 



jfappus-squameiiae unear-ianceolate» gradually tapering into the awn 



Leaves linear-lanceolate or lanceolate; squaraellae 4-5 mm. long. 4. P macroleuis 

 L.eaves narrowly Imear; squamellae 2 mm. long or less. 5. P. tenuifolia. ' 



1. P. major (A. Gray) Greene. Stem 3-6 dm. high, glabrous; lower leaves 

 petioled,the_ upper sessile and half-clasping, glabrous; blades lanceolate or elliptic, 

 entire, laciniate-toothed or pinnatifid with lanceolate divisions; involucres 15-20 

 mm. high, often finely puberulent; bracts proper 10-15, linear-lanceolate, at- 

 tenuate; squamellae about 2 mm. long, oblong, truncate or 3-toothed at the 

 apex, the middle tooth ending in a plumose bristle about 5 mm. long. Microseris 

 major A. Gray. Hillsides and valleys: Mont.— Utah— Calif.— B.C. Son. Ap-Jl. 



2. P, nutans (Geyer) Greene. Stem 2-5 dm. high, slender; lower leaves 

 petioled, the upper sessile; blades linear or narrowly linear-lanceolate, entire 

 or pmnatifid with rather short divergent lobes; involucres turbinate, 10-15 mm. 

 high; bracts 8-10, lanceolate, acuminate; squamellae 2 mm. long, oblanceolate, 

 truncate and slightly toothed at the apex; awns 4-5 mm. long. M. nutans A. 

 Gray. Hillsides and valleys : Mont.— Colo.— Calif.— B.C. Son^—SuhmonL'My- 



h 



. ^ 3. P. graciloba (Kellogg) Greene. Stem slender, 2-6 dm. high, glabrous or 

 mmutely puberulent; leaves pinnatifid, with elongate narrowly hnear divisions, 

 or the uppermost linear and entire; involucres turbinate, 10-15 mm. high; bracts 

 9-12, linear-lanceolate, attenuate; pappus-squamellae oblong, truncate, 2 mm. 

 long; bristles about 5 mm. long. Calais graciloba Kellogg. M. major laciniaia A. 

 Gray. Hills and grasslands: Mont.— Utah— Calif.— B.C. Son. My-JL 



4. P. macrolepis Rydb. Stem 2-5 dm. high; lower leaves petioled, the 

 upper sessile; blades linear-lanceolate, entire or rarely pinnatifid with linear- 

 lanceolate divergent divisions; involucres turbinate, 2 cm. high; bracts proper 

 12-15, linear-lanceolate, attenuate; pappus-squamellae lanceolate, 4-5 mm. 

 long; bristles 6-7 mm. long. Benchlands: Utah. Son.—SuhinonL Ap-Je. 



5. P. tenuifolia Osterhout. Stem very slender, 1-3 dm. high, often scapi- 

 form; leaves narrowly Unear, entire or with a few distant linear lobes directed 

 dowTiwards; involucres turbinate, 12-15 mm. high; bracts 8-15, linear-lanceolate, 

 attenuate; squamellae lanceolate; awns 5-6 mm. long. Hillsides and valleys: 

 Colo. — Utah. Mont, Je-Au. 



3. PTILORIA Raf. Desert Pink, Flowering STRAW^ 



Rush-hke slender plants, with the upper leaves reduced and mostly bract-like. 

 Heads small, 3-20-flowered. Involucres cylindric, rarely campanulate. Bracts 

 few, in a single series, with a few small calyculate ones at the base. Flowers 

 pink or flesh-colored. Achenes prismatic, truncate at both ends, strongly angled, 

 glabrous, often rugose, the base broad and hollowed. Pappus of 10-20 bristles, 

 somewhat paleaceous at the base, plmnose at least above the middle. [Stephano- 

 meria Nutt.J 



Perennials. 



Heads lO-20-flowered; involucres over 1 cm. high; leaves broad, rimcinate. with short 



lobes. 1. P. parryL 



Heads 3-9- (mostly 5-) flowered. 



Pappus plumose to the base; involucres 7-10 mm. high. 



Leaves very narrow, almost fiJiform and usually entire. 2. P. tenuifolia. 



Leaves, at least the lower ones, broad, oblanceolate in outline, and runcinate. 



_ , 3. P. ramosa. 



Pappus merely scabrous or liirsutulous at the base. 



Leaves runcinate, but narrow; involucres 9-10 mm. high. 4. P. pauciflora. 

 Leaves lincar-flliform; involucres 5-6 mm, high. 5. P. murioclada. 



Annuals or biennials. 



Pappus-bristles not dilated at the base; heads usually subsessile on spike-like branches. 



n X * 6, P, virqata. 



Pappus-bristles somewhat dilated at the base, often more or less miited ; heads panicu- 

 late. 



Pappus plumose to the base or nearly so; plant tall and slender. 7. P. paniculaia. 

 Pappus plmnose only above the middle; plant usually low and stout. 



8. P. exigua. 



1- P. Parryi (A. Gray) Coville. Stem rather stout, white, 1-3 dm. high, 

 branched; leaves thickish, runcinate-pinnatifid; lobes reflexed, spinulose-tipped; 



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