WOOTON AND STANDLEY — FLORA OF NEW MEXICO. 523 



KEY TO THE SPECIES. 



Leaves alternate, rigid, spinescent 1. L. brevifolium. 



Leaves opposite, neither rigid nor spinescent 2. L. nuttallii. 



1. Leptodactylon brevifolium Rydb. Bull. Torrey Club 40: 474. 1913. 

 Type locality: Juniper Range, Utah. 



Range: Washington and Nevada to Colorado and New Mexico. 

 New Mexico: Cedar Hill; near Ojo Caliente. Dry hills and plains, in the Upper 

 Sonoran Zone. 



2. Leptodactylon nuttallii (A. Gray) Rydb. Colo. Agr. Exp. Sta. Bull. 100: 279. 



1906. 



Qilia nuttallii A. Gray, Proc. Amer. Acad. 8: 267. 1870. 



Type locality: "Rocky Mountains of Colorado and Utah to the Sierra Nevada in 

 California." 



Range: Washington and California to Wyoming and New Mexico. 



New Mexico: Ramah; Burro Mountains; Mogollon Mountains; White Mountains. 

 Mountains, in the Transition Zone. 



Most of our specimens are considerably taller and more slender than the typical 

 form, and are inclined to be woody throughout. 



5. MICROSTERIS Greene. 



Slender annual with mostly alternate leaves and small, loosely cymose or scat- 

 tered, purplish flowers; calyx at length ruptured by the capsule; corolla salvertorm, 

 with a narrow throat; seeds mucilaginous when wetted, without spiracles. 



1. Microsteris micrantha (Kellogg) Greene, Pittonia 3: 303. 1898. 



Collomia micrantha Kellogg, Proc. Calif. Acad. 3: 18. 1863. 



Type locality: "Vicinity of Silver City, Nevada Territory." 



Range: Nebraska and Wyoming to California and New Mexico. 



New Mexico: Sandia Mountains; Tierra Amarilla. Open slopes, in the Transi- 

 tion Zone. 



6. PHLOX L. Phlox. 



Perennial herbs, 30 or 40 cm. high or less, the base of the stem often woody, with 

 opposite sessile leaves and cymose flowers with showy corollas; calyx narrow, scari- 

 ous between t he lobes; corolla salverform, constricted in the throat; stamens une- 

 qually inserted, included; capsules ovoid, ultimately rupturing the persistent calyx. 



KEY TO THE SPECIES. 



Plants densely cespitose, forming thick mats; leaves more or less 

 fascicled. 

 Leaves with many cobwebby hairs, not glandular-ciliate; plant 



of low dry hills 1. P. canesct us. 



Leaves glandular-ciliate, without cobwebby hairs; plant of al- 

 pine meadows 2. P. caespitosn. 



Plants not cespitose, loose, erect; leaves not fascicled. 

 Tube of the corolla fully twice as long as the calyx. 



Calyx 13 to II mm. long; leaves long, 20 to 40 mm., linear 



or nearly so 3. P. stansburt/i. 



Calyx leu than 10 mm. long; leaves short, 10 to 20 mm., 



linear-lanceolate 4. P. grayi. 



Tube of the corolla considerably less than twice as long as the 

 calyx. 



