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



11. Arenaria congesta Nutt. ex. Torr. and Gray, Fl. North Amer 

 1: 178. 1838. 

 "Arizona," without definite locality {Palmer in 1869). This speci- 

 men belongs to var. subcongesta S. Wats. (A. subcongesta Rydb.) . The 

 species ranges from Montana to Washington, south to Colorado, 

 Arizona (?), and California. 



5. SPERGULARIA." Sandspurry 







Plant annual, somewhat fleshy, usually glandular-pubescent, with 

 spreading or prostrate, branched stems; leaves narrow, nearly terete, 

 often fascicled; sepals 5; petals usually 5, sometimes wanting; styles 

 3; capsule longitudinally dehiscent to the base. 



1. Spergularia marina (L.) Griseb., Spicil. Fl. Rumel. et Bith. 1: 213. 



1843. 



Arenaria rubra L. var. marina L., Sp. PL 423. 1753. 

 Spergularia salina Presl., FL Cech. 95. 1819. 



Southern Yavapai, Gila, Maricopa, Pinal, and Pima Counties, 1,000 

 to 3,000 feet, moist, strongly saline soil, March to June. Throughout 

 most of the Northern Hemisphere. 



The Arizona specimens are of the smooth-seeded form, S. leiosperma 

 (Kindb.) Fern, and Wieg. 



6. DRYMARIA 



Plants annual, with slender, usually tufted stems; stipules present 

 but sometimes fugacious; sepals 5; petals 2- to 5-cleft or -parted; 

 stamens usually 5; capsule longitudinally dehiscent. 



Key to the species 



1. Stem leaves nearly as wide as to wider than long, elliptic to suborbicular, at 

 least 4 mm. wide (2). 

 2. Plant bright green, glandular-puberulent; leaf blades thin, subreniform, 

 wider than long, abruptly short-acuminate or apiculate; flowers in long- 

 peduncled, dense or rather loose clusters; sepals lanceolate, setose- 

 acuminate 1. D. FENDLERI. 



2. Plant glaucous, glabrous; leaf blades thickish, ovate or broadly elliptic, as 



long as or longer than wide, obtuse; flowers in sessile or subsessile axillary 



clusters; sepals ovate, obtuse or apiculate 2. D. pachyphylla. 



1. Stem leaves much longer than wide, linear, narrowly lanceolate, or oblanceolate, 

 not more than 2 mm. wide; flowers in open, mostly terminal cymes (3). 



3. Cauline leaves fascicled, appearing verticillate; mature capsules 3 to 5 



mm. long 3. D. sperguloides. 



3. Cauline leaves opposite; mature capsules not more than 2.5 mm. long (4). 

 4. Herbaceous portion of the sepals (not the scarious margin) acute; plant 

 glabrous; petals shorter than or barely equaling the sepals. 



4. D. TENELLA. 



4. Herbaceous portion of the sepals obtuse (5). 



5. Plant usually puberulent; stems 6 to 15 cm. long, erect, branching above; 



petals usually considerably surpassing the sepals 5. D. effttsa. 



5. Plant glabrous or very nearly so; stems not more than 5 cm. long, diffuse, 

 branching from the base; petals not surpassing the sepals. 



6. D. depressa. 



41 Reference: Rossbach, Ruth P. spergularia in north and south America. Rhodora 42: 105-143, 

 158-193, 203-213. 1940. 



