[Vor. 11 
266 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
1922, Munz 5657 (Pomona); Tahquitz Valley, San Jacinto 
Mts., 6 July, 1922, Munz 5995 (Pomona). 
M. Suksdorfit is а small, usually compact, much-branched 
annual with numerous flowers close together, differing in these 
characters from M. rubellus with which it is most easily confused. 
M. rubellus is usually a taller plant, with few branches and with 
larger flowers scattered along the stems. Dr. Gray separated 
the two species mainly on corolla characters, but these do not 
hold. М. Suksdorfii has all of the corolla-lobes notched, but 
M. rubellus varies in this respect, all of the lobes being emarginate 
or only those of the upper or of the lower lip. Тһе ciliate calyx- 
teeth of M. rubellus have also been used as a distinguishing 
character, but this is not constant, either. Тһе usually low, 
compact, bushy habit, together with the generally smaller calyx 
and corolla and the unequal stigma-lobes of M. Suksdorfii, seem 
to be the best way of separating the two species. 
69. M. rubellus Gray ex Torr. Bot. Mex. Bound. 116. 1859; 
Proc. Am. Acad. 11:99. 1876, in part; Syn. Fl. №. Am. 21:278. 
1878, ed. 2, and Suppl. 451. 1886, in part; Bot. Calif. 1: 568. 
1876, in part; Greene in Bull. Calif. Acad. Sci. 1: 116. 1885; 
Wooton & Standley, Contr. U. S. Nat. Herb. 19: 587. 1915; 
Howell, Fl. Northwest Am. 522. 1903; Nelson in Coulter & 
Nelson, Manual Cent. Rocky Mountains, 453. 1909; Jepson, 
Fl. W. Mid. Calif. 403. 1901, and ed. 2, 378. 1911; Rydberg, 
Fl. Rocky Mountains, 780. 1917. ; 
М. gratioloides Rydb. in Bull. Torr. Bot. Club 28: 27. 1901; 
Fl. Rocky Mountains, 780. 1917. 
Stem 3-20 cm. high, erect, simple or branched from the base, 
the whole plant glandular-puberulent to almost glabrous, usually 
more or less reddish in color; leaves oblong to lanceolate or linear, 
obtuse, .7-1.7 em. long, 2-5 mm. broad, narrowed to 8 de 
base, the lowest leaves occasionally petiolate, 1-3-nerved, 
margins entire or irregularly toothed; flowers scattered, 
pedicels slender, 1-2 cm. long, spreading; calyx tubular, 4-9 mm: 
long, 1.5-2.5 mm. broad, teeth short, rarely over 1 mm. long, 
usually ciliate, equal, broadly ovate, rounded, mucronate, yet 
the calyx а more or less truncate appearance, the ribs and o 
