

Compositaceae 403 
II. Stems glandular only near top; clusters of heads racemosely arranged on 
the plant. W.C.E. M. glomerata Hook. 
AA. _Disk-flower only 1, its corolla glabrous, heads small, 2—6 mm. high, scattered; 
ray-corollas 2—6 mm. long; peduncles long, filiform; pappus none. W.C.E. (M. 
exigua macrocephala; Harpaecarpus madarioides. ) M. exigua Gr. 
HEMIZONIA 
Leaves narrow, all but the lowest alternate, entire to pinnatifid. Heads radiate, 
small or medium, few- to many-flowered; involucre-bracts as many as the ray-flowers, 
concave, half-enclosing the akenes, rarely a few extra outer ones; receptacle flat or conic. 
Ray-flowers 1—20, pistillate, fertile, white or pink or yellow, 2—3-toothed: akene 
turgid, swollen on one side, obovoid. Disk-flowers | to many, perfect, fertile or sterile, 
white or pink or yellow, 5-lobed: akenes rarely formed, narrower than those of rays. 
Pappus none or of 12 or fewer scales which are often awn-tipped. (Gk. hemit=half, 
zone—a girdle; because the ray-akenes are swollen on | side.) 
A. Flowers white or pinkish. 
B. Stem glandular above; ray-flower 5—-20; pappus none; akene glabrous. 
C. Stems branched above; leaves linear-lanceolate, 3—-5-veined. U. 
H. luzulaefolia DC. 
CC. Stems branched from near the base; leaves narrowly linear, |-veimed. U. 
H. clevelandi Gr. 
BB.- Stem not glandular; ray-flowers 3—5; pappus of 10—12 scales; akene some- 
what hairy. U. (Calycadena multiglandulosa. ) 
H. multiglandulosa Gray 
‘AA. Flowers yellow. 
D. Plant glabrous, smooth; all the leaves entire, linear, the upper gland-tipped; pee 
pus of 7—10 scales. UU. (Calycadenia truncata.) 
H. truncata Gray 
DD. Plant hairy; basal or stem leaves pinnatifid, all spine-tipped. 
E. Stem-leaves pinnatifid but those of the branchlets entire; pappus none. W. E. 
H. pungeus Torr. ; 
EE. Stem-leaves entire, linear or subulate; pappus of 8—12 scales. U. E. 
(Centromadia fitchii.) H. fitchii Gray 
HEMIZONELLA 
Annual; ours 2.5—15 cm. high, white-hairy, much branched. Leaves mostly op- 
posite; in ours linear, about 1.2 mm. long, entire. Heads radiate, small, few-flowered ; 
involucre-bracts herbaceous, as many as the ray flowers, each completely enclosing an 
akene, rounded on the back; receptacle-chaff forming an herbaceous 3—5-toothed cup 
enclosing the disk-flowers. Ray-flowers 4—5, pistillate, fertile, yellow, very short, 
glabrous or glandular. Disk-flower |—2, perfect, fertile, yellow, glabrous or glandular. 
Akencs obovate or fusiform, -flattish, slightly hairy. Pappus none. Dimniutive of Hemi- 
zonia, a related genus.) W.C. (H. parvula.) 
H. durandii Gray 
LAGOPHYLLA 
Annual, slender, much-branched; ours |.5—7.5 dm. high, hairy. Leaves entire; 
in ours mostly alternate, oblanceolate to linear-lanceolate, 2.5—5 cm. long. Heads 1a- 
diate, small, several-flowered, in scattered clusters (ours) ; involucre-bracts as many as the 
rays--a few exterior ones (ours), herbaceous, infolded at margin, enclosing the ray- 
