404 Compositaceae 
akenes; receptacle flat, fimbrillate-hirsute in the middle, chaffy between the ray- and disk- 
flowers; chaff in a single series of 5——6 distinct scales. Ray-flowers about 5, pistillate, 
fertile, yellow (ours), wedge-shaped, 3-cleft or -parted. Disk flowers 5—6, perfect, 
sterile, 5-lobed. Akenes cuneate-oblong, flattish, smooth. Pappus none. (Gk. lagos-=a 
rabbit, phyllon—a leaf. Why?) E. 
L. ramosissima Nutt. 
LAYIA 
Hairy, black-glandular, viscid above, |—3 dm. high (ours). Leaves mostly alter- 
nate, in ours lanceolate to linear, entire to laciniately incised. Heads radiate, many- 
flowered, 1.5—2.5 cm. wide (ours) ; involucre-bracts as many as the rays, their ma gins 
thin and infolded on the ray akenes; receptacle wide, flat, with a series of thin chafty 
bracts between ray- and disk-flowers. Ray-flowers 8—14 (ours), pistillate, fertile, white 
(ours), 3-toothed (ours): pappus none but replaced by a disk-like protuberance. Disk- 
flowers many, yellow, 5-lobed: pappus of 10—20 awns: awns equal, hairy below (ours). 
Akenes flattish or angular. (Origin?) E. (Apparently L. douglasii; Blepharipappus 
glandulosus. ) “Mf. glandulosa Hook. 
ACHRYACHAENA 
Annual; ours villous-pubescent. Leaves alternate or the lowest opposite, narrowly 
linear, sessile, entire or the lowest laciniate. Heads radiate, many-flowered, terminal on 
the branches, 2.5 cm. or less long; involucre-bracts herbaceous; receptacle chaffy only 
between the ray- and disk-flowers. Ray-flowers 6—10, pistillate, fertile, yellow, little 
exceeding the disk-flowers, tube much exceeding the limb: pappus none. Disk-flowers 
perfect, fertile, yellow, 5-toothed: pappus of about 10 scales; scales silvery, blunt, in 2 
series, outer 5 shorter. Akenes 10-ribbed, fattish to nearly terete. (Gk. achyron—chaff, 
achaino==an akene; probably on account of the chaff-like pappus.) U., 
? A. mollis , tin 
HELENEAE  (SNEEZE-WEED TRIBE)—Ours herbs. Heads in ours radiate 
or apparently rayless; involucre-bracts not scarious: receptacle naked except in Gaillardia. 
Ray-flowers usually fertile. Disk-flowers usually perfect, fertile, 4__5-toothed, tubular. 
Anthers not tailed at base. Style-branches of perfect flowers truncate or appendaged, 
not flat. Pappus none or chaffy or awns or bristles but the bristles not capillary. 
A. Leaves opposite except sometimes the upper. 
B. Leaves entire. 
C. Plants of salt-marshes. 
D. Pappus none; involucre-bracts not united. JAUMEA (p. 405) 
DD. Pappus of 5—-10 chaffy scales; involucre-bracts united into a 5—15- 
toothed cup. LASTHENIA (p. 405) 
CC. Plants of dry soil, not of salt-marshes. 
E. Involucre-bracts flat; receptacle conic to subulate. BaerRiA (p. 405) 
EE. Involucre-bracts inrolled, receptacle flat. RIGIOPAPPUS (p. 406) 
BB. Leaves palmately 2—5-parted. BAHIA (p. 406) 
AA. Leaves alternate. 
F. _ Heads radiate. 
G. Receptacle not chaffy. 
H. Akenes 4-angled; pappus-scales blunt or lacerate. 
I. Involucre-bracts somewhat united: rays none or present; herbage floccose- 
woolly. ERIOPHYLLUM (p. 405) 

