666 MISC. PUBLICATION 423, U. S. DEPT. OF AGRICULTURE 



2. Primula rusbyi Greene, Torrey Bot. Club Bui. 8: 122. 1881. 

 Mountains of Graham, Cochise, and Pima Counties, 7,500 to 10,300 



feet, usually on damp mossy ledges, May to July. New Mexico and 

 southeastern Arizona. 



3. Primula specuicola Kydb., Torrey Bot. Club Bui. 40: 461. 1901. 



? Primula hunnewellii Fernald, Rhodora 36: 117. 1934. 



North rim of the Grand Canyon, flowering June (Eastwood and 

 Howell 1024, a rather large form with some of the scapes 15 cm. 

 long), type of the doubtfully distinct P. hunnewellii also from the 

 Grand Canyon. Southern Utah and northern Arizona. 



2. ANDROSACE <> 



Small tufted plants; flowers inconspicuous, slender-pedicelled, in 

 umbels subtended by an involucre of small, nearly separate bracts; 

 corolla constricted at the throat, white or whitish, not surpassing 

 the calyx at anthesis. 



Key to the species 



1. Bracts subtending the inflorescences elliptic or ovate and more or less rhombic; 

 plants of low altitudes (below 5,000 feet), flowering in early spring. 



1. A. OCCIDENTALS. 



1. Bracts lanceolate or subulate; plants of high altitudes (above 6,000 feet), 

 flowering in summer 2. A. septentrionalis. 



1. Androsace occidentalis Pursh, Fl. Amer. Sept. 1'37. 1814. 

 Graham, Pinal, Maricopa, Cochise, Santa Cruz, and Pima Counties, 



1,200 to 5,000 feet, along streams and on hillsides, February to April. 

 Western Canada to Illinois, Texas, and Arizona. 



The var. arizonica (A. Gray) St. John (A arizonica A. Gray) with 

 larger, green and foliaceous calyx lobes, these more spreading than 

 in the typical form or even slightly recurved, is found throughout 

 most of the range of the species in Arizona. It often grows with the 

 typical form and intergrades with it. 



2. Androsace septentrionalis L., Sp. PL 142. 1753. 



Kaibab Plateau (Coconino County), White Mountains (Apache 

 County), south to the mountains of Cochise and Pima Counties, 

 7,000 to 12,000 feet, usually in springy places in coniferous forests, 

 May to September. Widely distributed in the cooler parts of the 

 Northern Hemisphere. 



Key to the varieties 



1. Scapes few, often only 1 strongly developed, this strictly erect; central pedicels 

 straight, erect or nearly so, the outer ones mostly ascending (2). 

 2. Pedicels not glandular A. septentrionalis (typical). 



2. Pedicels bearing dark stipitate glands var. glandulosa. 



1. Scapes several, of nearly equal length; pedicels mostly spreading or ascending- 

 spreading (3). 



3. Plant pale green; scapes 10 to 25 cm. long, about twice as "long as the slender, 



flexuous, wide-spreading, often very numerous pedicels. 



var. SUBULIFERA. 



e Reference: St. John, Harold, revision of certain north American species of androsace. 

 Victoria Mus. Mem. 126: 45-55. 1922. 



