CHICORY FAMILY 1017 



Pappus-squamellae linear-lanceolate, gradually tapering into the awn. 



Leaves linear-lanceolate or lanceolate; squamellae 4-5 mm. long. 4. P. macrolepis. 

 Leaves narrowly linear; 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 pinnatifid 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. Submont. My- 



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

 minutely puberulent; leaves pinnatifid, with elongate narrowly linear 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 laciniata 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. Submont. Ap-Je. 



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

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

 downwards; 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-like 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, plumose at least above the middle. [Stephano- 

 meria Nutt.] 



Perennials. 



Heads 10-20-flowered ; involucres over 1 cm. high; leaves broad, runcinate, with short 



lobes. 1. P. Parryi. 



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



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



Leaves very narrow, almost filiform 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 hirsutulous at the base. 



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

 Leaves linear-filiform ; involucres 5-6 mm. high. 5. P. myrioclada. 



Annuals or biennials. 



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



6. P. virgata. 



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

 late. 



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

 Pappus plumose 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; 



36* 



