o Contributions from the Gray Herbarium 
a. — rma ag glabrous; the leaves glabrous on both sur- 
aces 
b. Calyx campanulate-turbinate, the lobes much shorter 
than anthesis..7. M. campanulata. 
b. Calyx not ‘campanulate, or the lobes oer mons after an- 
thesis to equal or far exceed t 
c. Leaves sessile, except the lowest, eer or coliees: not 
ovate-acuminate 
d. —_— about three times — than broad; corolla 
lar-funnelfor 
Cal yx s in hat sl than mee 
Be ae Se ie i ee a . M. arizonica. 
Cobsaienes as long as or longer than the tube, ie as 
latter sometimes nearly obsolete....... 8a. var. umbratilis. 
d. Leaves = more than — de than broad; cor- 
Gms narrows Gabuber. 35 5 CPR AS. 9. M. praecox 
€: comer petiolate, except “the upper, and ovate-acumi- 
eet in anthesis 4-5 mm. long, the lobes elongate. 
10. M. laevigata. 
Calyx in anthesis about 2 mm. long, the lobes short. 
10a. var. brachycalyz. 
Subsection CrLiaTAE 
Style included in the full-grown corolla or barely exserted; 
calyx-lobes seldom more than 2 mm. oi the sinuses be- 
taeen them broad. 
Leaves prec on the ae a pees we a 11. M. subpubescens. 
Leaves glabrous on both su 
Tattiesoaies: rade inal, ri ‘fin the upper axils the pe- — 
duncles much shorter rar the Ave So oer ie. 12. M. ciliata. 
Inflorescence termin: = axillary, the aan ere —— 
i 12a. me isola a a 
abe 
often ex eavi 
aie" vel exserted from the full-grown corolla; calyx-lo 
5-3 mm. long, their sinuses nearly or quite closed. : 
13. M. stomatechoides. 
Subsection LANCEOLATAE 
a. sicap ont alpine or subalpine species with numerous basal 
ves, green; calyx-tube short; calyx-lobes of soft 
ra ure, 2-5 mm. rs in anthesis, the midrib not evi- 
dent or at least not pronounced in fruit; midrib of 
e leaves not strongly developed (eee some- 
imes in number 21 
b. oo glabrous, at least below 
Inflorescence a lea rang toatl panicle, the racemes 
ie even in anthesis; calyx-lobes ovate-lanceo- 
ate. 
DROME, Free yee 
e Racemes : terminal and axillary (when well pectic), 
lobes linear or lanceolate d. 
d. Leaves — on both cola 
Hairs in corolla-tube ‘inatbioels inflorescence be- 
ianinn lon $0 fret ee 15. M. coronata. 
