308 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



8. Plant bluish green; stems usually 20 cm. long or longer, strict; leaf 

 blades erect or nearly so, some of them usually at least 30 mm. 

 long, not very rigid or very sharply pungent; sepals normally 

 lanceolate or linear-lanceolate; petals white; inflorescence glandu- 

 lar 7. A. FENDLERI. 



8. Plant light green or yellowish; stems usually not more than 15 cm. 



long; leaf blades more or less spreading, commonly not more than 

 20 mm. long, very rigid and sharply pungent; sepals normally 

 oblong-lanceolate or ovate-lanceolate; petals often yellowish. 



8. A. EASTWOODIAE. 



7. Petals usually conspicuously surpassing the sepals; plants loosely 

 cespitose (9). 



9. Stems glandular-puberulent, at least in the inflorescence; basal 



leaves densely crowded; capsule conspicuously surpassing the 



calyx 9. A. aculeata. 



9. Stems glabrous throughout; basal leaves not densely crowded; 

 capsule rarely much surpassing the calyx (10). 

 10. Flowers numerous, long-pedicelled, in large, very open cymes; 

 stems suffrutescent, conspicuously swollen at the nodes. 



10. A. MACRADENIA. 



10. Flowers few, sessile or subsessile, in small, compact cymes; stems 

 not or barely suffrutescent, not conspicuously swollen at the 

 nodes 11. A. congesta 



1. Arenaria douglasii Fenzl ex Torr. and Gray, Fl. North Amer. 



1:674. 1840. 

 Gila and Maricopa Counties, chiefly in the vicinity of the Mazatzal 

 Mountains, 2,300 to 3,500 feet, sandy soil, March to June. Arizona 

 and California. 



2. Arenaria verna L., Mant. 72. 1767. 



Arenaria propinqua Richards., Bot. App. Franklin Jour. ed. 

 2, 17. 1823. 



San Francisco Peaks (Coconino County), 11,000 to 12,400 feet, 

 July and August. Hudson Bay to Mackenzie, south to Arizona and 

 California ; Eurasia. 



In addition to the ordinary glandular-puberulent form (var. 

 pubescens (Cham, et Schlecht.) Fernald, A. propinqua Richards.), a 

 glabrous form with purplish sepals (A. verna var. pubescens f. epilis 

 Fernald) was collected by E. L. Little, Jr., among lava boulders at 

 12,000 feet. 



3. Arenaria sajanensis Willd. in Schlecht., Mag. Gesell. Naturf. 



Freund. Berlin 7: 200. 1813. 

 San Francisco Peaks, 11,500 to 12,000 feet (Knowlton 128, Little 

 4654), August. Alberta and British Columbia to New Mexico and 

 northern Arizona; Siberia. 



4. Arenaria confusa Rydb., Torrey Bot. Club Bui. 28: 275. 1901. 

 Navajo, Coconino, and Yavapai Counties to Cochise and Pima 



Counties, 6,000 to 8,500 feet, pine forests, July to September. 

 Colorado, Utah, New Mexico, and Arizona. 



The commonest species at moderate elevations in central and 

 southern Arizona. 



5. Arenaria saxosa A. Gray, PL Wright. 2: 18. 1853. 



Arenaria polycaulos Rydb., Torrey Bot. Club Bui. 31: 406. 

 1904. 

 White Mountains (Apache County), San Francisco Peaks (Co- 

 conino County), Pinaleno Mountains (Graham County), Santa 



