336 COMPOSITAE 
5. Machaeranthera tortifolia ee & oe ae & Keck. Desert or Mojave 
. Fig. 557 
me 
i Torr. & Gray ex A. Gray. Bost. Journ. Nat. Hist. 5: 109. 1845. 
emma hortibolio hs Gray, Proc. Amer. Acad. 7: 353. 1868. Not Michx. 1803 
Aster mohavensis Coville, nied U.S. Nat. Herb. 4: 126. 1893. Not Kuntze, 1891. 
Aster tortifolis us var. funerew s M. E. Jones, gre Calif. Acad. II. 5: 695. 1895. 
X ylorrhiza Greene, Pittonia 3: 48. 18 
X ylorrhiza lancacdata Rydb. Bull. ~~ Club < 146. 1910. Not Aster lanceolatus Willd. 1803. 
Aster abatus Blake, Contr. U.S. Nat. Herb. 25: 562. 1925. 
Machaeranthera tortifolia Cronq. iy Wek: Brittonia 9: 239. 1957. 
Suffruti ens about 0.6 m. high, erect-branched, white-barked, loosely cinereous- -pilose-tomen- 
tose pia ia the Zine spiitaic -glandular, and sparsely pilos se, the branches leafy. Leaves 
inear to lan a oblan eolat or ue ng, 2-7 cm. long, 8 . wide, acuminate or acute, 
e-t d 
isted, 1-nerved and veiny ; heads soli tary at tips of branches, 3-5 cm. wide, on naked or sparsely 
e i ucres i te, 9-15 mm. 
ner with o 
lavender or violet "0.5 cm. long; pres “elliptic. oa een compressed, oie 4- siete 4 silky- 
pilose ; patna Seanles stiff, unequal, the inner somewhat flattened. 
Usually ore in desert hilly or mountainous places, Sonoran ok Death Valley region to norther 
Calorade Desert, "Gals nia, east to southern Utah oer, Soaters Arizona s outh to Yuma County. Type celts; 
mountains of re aeerhed April—Oct. 
6. Machaeranthera cognata (H. M. Hall) Cronq. & Keck. Mecca Aster. 
Fig. 5573 
Aster cognatus H. M. 1, Univ. Calif. Pub. Bot. 6: 173. Mat 
Aster standle vi Davidson, ite. S. Calif. Acad: 22: 5. pl. 
Xylorrhiza standleyi Davidson in Davids. & Moxley, FI. : Cal ger. 1923. 
Machaeranthera cognata Cronq. & Keck, Brittonia 9: 239 
Similar to M. orcuttii, the branches somew sia ae ing. Leaves sparsely glandular, sessile on 
wer part of the stem, sista: those above and on the branchlets usually cuneate at t the base, 
poe ae acute and spine tipped at apex, th gins with e, spreading, spinose teeth on 
eac nel 5 cm. long or less dular above; involuc t 1.5- high, the 
gaiiacins aarrow!y linear or lance-linear, attenuate, os e — sometim t equalin 
or surpassing the inner, net s much shorter, he in re then dade yt graduate, all sparsely 
glandular on back and Ore on margin, the inner lacerate. es dened 
scarious-ma ome base; rays blue or violet, 1.5-2 cm. lo nes and pappus as in M. orcuttit. 
jo sae Lower sD Zone; Coachella Valley, Colorado Bes in the vicinity of Indio and Mecca, 
Riverside Denney. Palifornia Type locality: near Indio, north side of Coachella Valley, Riverside County. May- 
Jun 
5572. Machaeranthera tortifolia 5573. Machaeranthera cognata 
