938 CARDUACEAE 



82. MADIA Molina. 



Glandular-viscid, heavy-scented annuals. Leaves alternate, entire, narrow. 

 Heads radiate. Involucre campanulate; bracts in a single series, strongly in- 

 flexed on the margins enclosing the ray-achenes; paleae in a single series enclos- 

 ing the disk-flowers as an inner involucre inside the rays. Ray-flowers pistil- 

 late, fertile; ligules inconspicuous, cuneate, 3-lobed. Disk-flowers hermaphrodite 

 and fertile. Achenes angled, those of the ray-flowers laterally flattened, very 

 oblique. Pappus wanting. 



Ray-flowers 5-12; heads not glomerate. 



Heads on short branches, racemosely disposed. 1. M. racemosa. 



Heads on long branches, more corymbose. 2. M. dissitiflora. 



Ray-flowers 2-5, or none; heads glomerate. 3. M. glomerata. 



1. M. racemosa T. & G. Stem 3-6 dm. high, pilose, glandular above; 

 leaves linear, 8-15 cm. long, pilose on both sides; branches of the inflorescence 

 short; involucres 8-10 cm. high and broad; ligules 5-8; disk-achenes flat, indis- 

 tinctly nerved. M . sativa racemosa A. Gray. Rocky or sandy places: B.C. Ida. 

 Utah Calif. Son. My-Jl. 



2. M. dissitiflora (Nutt). T. & G. Stem slender, pilose, 3-6 dm. high; 

 leaves linear or lance-linear, finely pilose, entire; heads scattered, solitary at the 

 ends of rather slender branches; involucres about 6 mm. high and broad, glandu- 

 lar; ligules 5-8; achenes all flat, not at all angled. Hillsides and valleys: B.C. 

 Mont. Utah Calif. Submont. Je-Au. 



3. M. glomerata Hook. Stem 3-5 dm. high, leafy, hirsute, glandular in 

 the inflorescence; leaves linear, pilose and hirsute-ciliate; heads more or less 

 glomerate; involucres about 6 mm. high and 4 mm. wide; rays 2-5, sometimes 

 none; achenes of the rays somewhat curved, 1-nerved on each face, those of the 

 disk 4- or 5-angled. Open places in the mountains: Sask. Colo. Calif. B.C. 

 Son. Mont. Jl-S. 



83. HARPAECARPUS Nutt. 



Slender annuals, with narrowly linear leaves. Heads ligulate. Involucre 

 campanulate; bracts 4r-8, in a single series, boat-shaped, each enclosing a ray- 

 achene; paleae of the receptacle united into a 3-5-toothed cup, surrounding the 

 single disk-flower. Ray-flowers 4-8, fertile; ligules inconspicuous, cuneate. 

 Disk-flower single, hermaphrodite and fertile. Ray-achenes compressed later- 

 ally, lunate, but broader above; disk-achene obliquely obovate. Pappus want- 

 ing. 



1. H. exiguus (Smith) A. Gray. Stem slender, 1-3 dm. high, hirsute as 

 well as glandular-puberulent, paniculately branched; heads on filiform peduncles; 

 involucres about 3 mm. high and broad; bracts 4-8, hirsute-glandular. Madia 

 filipes A. Gray. Open ground: B.C. Ida. L. Calif. Son. My-Jl. 



84. HEMIZONELLA A. Gray. 



Hirsute pubescent and glandular annuals, with linear, mostly opposite leaves. 

 Heads radiate, small. Bracts of the involucres 4 or 5, broad, infolded, enclosing 

 each a ray-achene; paleae united into a 3-5-toothed cup, surrounding the disk- 

 flowers. Ray-flowers 4 or 5, pistillate and usually fertile; ligules minute. Disk- 

 flowers solitary or rarely 2-4, hermaphrodite and fertile. Achenes somewhat 

 dorso-ventrally compressed, those of the disk-flowers straight, those of the ray- 

 flowers incurved. 



1. H. minima A. Gray. Annual; stem 3-10 cm. high, pilose; leaves 1 cm. 

 long or less, linear, pilose; peduncles shorter than the heads; involucres about 3 

 mm. high and broad; ray-achenes obovate, slightly curved, strongly obcom- 

 pressed. Dry sterile soil: B.C. Ida. Nev. Calif. Son. Je-Jl. 



85. LAGOPHYLLA Nutt. 

 ternate entire leaves and sm 



listers. Heads radiate. Bracts of the involucres about 5, thin, herbaceous, 

 with the margins at the base, infolded and each enclosing an achene, with which 



Slender herbs, with alternate entire leaves and small heads in leafy-bracted 

 Listers. Heads radiate. Rr.rfa r\f -n\a ir>xj-/-vi-nrtT.c, Krvn+- K. V,I'TI v.a*.Kaa/vna 



