150 CARYOPHYLLACEAE 



9. Arenaria obtusiloba (Rydb.) Fernald. Alpine Sandwort. Fig. 1689. 



Arenaria obtusa Torr. Ann. Lye. N.Y. 2: 170. 1827. Not All. 1785. 

 Arenaria biflora S. Wats. Bibl. Index 94. 1878. Not L. 1767. 

 Alsinopsis obtusiloba Rydb. Bull Torrey Club 33: 140. 1906. 

 Arenaria obtusiloba Fernald, Rhodora 21 : 14. 1919. 



Low, densely cespitose perennial, the lower parts of the stems clothed with the withered 

 leaves, flowering stems slender, 1-6 cm. high, glandular-pubescent, bearing 1 or 2 pairs of leaves. 

 Lower leaves narrowly linear, 4-8 mm. long, obtuse, rather rigid, ascending, midvein prominent, 

 short-ciliolate on the margins, otherwise usually glabrous; flowers 2 or 3 or usually solitary; 

 sepals oblong-lanceolate, 4 mm. long, obtuse, 3-nerved, glandular-pubescent; petals spatulate, 

 exceeding the sepals ; capsule exceeding the sepals, the valves obtuse, entire. 



Rocky slopes, Arctic-Alpine Zone; Alaska to Labrador, south in the mountains of the Pacific States to the 

 Sierra Nevada, California, and in the Rocky Mountains to New Mexico. Closely related to the Siberian Arenaria 

 sajanensis Willd. Type locality: Rocky Mountains. June— Aug. 



10. Arenaria serpyllifdlia L. Thyme-leaved Sandwort. Fig. 1690. 



Arenaria serpyllifolia L. Sp. PI. 423. 1753. 



Annual, puberulent throughout, much branched from the base, the stems slender, ascending 

 or decumbent, 1-2 dm. high. Leaves ovate, 4-7 mm. long, acute or short acuminate, sessile or the 

 lowest short-petioled ; flowers in open leafy-bracted cymes ; pedicels 5-10 mm. long ; sepals ovate- 

 lanceolate, acuminate, 3 mm. long ; petals 2 mm. long ; capsule exceeding the sepals, ovoid. 



Usually in moist sandy soils, naturalized from Europe, and widely distributed over North America. On the 

 Pacific Coast extending from British Columbia to southern California. April-July. 



11. Arenaria confusa Rydb. Rydberg's Sandwort. Fig. 1691. 



Arenaria confusa Rydb. Bull. Torrey Club 28: 275. 1902. 



Stems many from a stout perennial root, prostrate or decumbent, 2-5 dm. long, slender, the 

 whole plant more or less puberulent. Leaves oblong-lanceolate, 5-20 mm. long, acute, mucronate ; 

 flowers many, pedicels very slender, 1-2 cm. long ; sepals ovate-lanceolate, sharply acuminate, 

 3 mm. long, glabrous ; petals a little shorter than the sepals ; capsule ovoid, exceeding the sepals. 



Rocky or moist sandy soils, Arid Transition Zone; San Bernardino Mountains, California, and Sierra San 

 Pedro Martir, Lower California, to Texas, Arizona, Colorado, and New Mexico. Type locality: White Mountains, 

 New Mexico. June-Sept. This species has been confused with Arenaria saxosa A. Gray. 



12. Arenaria Franklinii Dougl. Franklin's Sandwort. Fig. 1692. 



Arenaria Franklinii Dougl. ex Hook. Fl. Bor. Amer. 1: 101. pi. 35. 1830. 



Plants cespitose, the caudex much branched, with rather slender procumbent branches. Leaves 

 subulate, 1-2 cm. long, minutely scabrous, finely ciliolate on the margins, sharply pungent, but 

 scarcely rigid ; flowering stems simple, 5-10 cm. long, leafy ; cymes dense, few-flowered, bracts 

 subulate; sepals lanceolate-subulate, 8-10 mm. long, pungent, 1-nerved; petals shorter than the 

 sepals. 



Dry rocky or sandy soils. Upper Sonoran Zone; Kittitas County, eastern Washington, to Harney County, 

 Oregon, and adjacent Idaho. Type locality: "Abundant on barren sandy plains and undulating grounds of the 

 Columbia from the Great to the Kettle Falls." May-July. 



Arenaria Franklinii var. Thompsonii M. E. Peck, Torreya 32 : 149. 1932. Leaves mostly appressed or 

 ascending; sepals 5-6 mm. long. Sandy sagebrush plains near Arlington, Gilliam County, Oregon. 



13. Arenaria formosa Fischer. Beautiful Sandwort. Fig. 1693. 



Arenaria formosa Fischer ex DC. Prod. 1: 402. 1824. 

 Arenaria capillaris Amer. authors. Not Poir. 



Cespitose, the branches of the caudex slender, somewhat woody, decumbent. Leaves filiform, 

 2-7 cm. long, mostly erect and often curved, minutely ciliolate, neither rigid nor pungent; 

 flowering stems 5-15 cm. high, bearing 2 or 3 pairs of leaves, smooth below, glandular above; 

 cymes few-flowered ; pedicels 5-20 mm. long ; sepals 3-4 mm. long, broadly oval, rounded or 

 broadly obtuse, broadly scarious-margined and usually colored, 1-nerved, glandular-puberulent ; 

 petals twice the length of the sepals. 



Alpine meadows, Arctic and Hudsonian Zones; British Columbia to Mount Hood, Oregon, east to Alberta, 

 Montana, and Utah. Also in Siberia. July-Aug. 



Arenaria salmonensis Henderson, Bull. Torrey Club 27 : 343. 1900. Cespitose perennial, the woody caudex 

 much branched below the surface of the ground; flowering stems 6-8 cm. high, with 1 or 2 pairs of subulate 

 leaves, glabrous below, glandular above and on the inflorescence. Lower leaves subulate, 10-15 mm. long, straight 

 or often curved, minutely serrulate on the margins, glabrous, somewhat rigid and pungent; bracts ovate, scarious; 

 cymes open, few-flowered; sepals ovate, obtuse, 2-3 mm. long, thin and often colored; petals about a half longer; 

 capsules slightly exceeding the sepals. Rocky slopes, Boreal Zones; Blue Mountains of eastern Washington and 

 Oregon to Montana. Type locality: dry gravelly plains, near the source of the Salmon River, Blaine County, 

 Idaho. Probably not specifically distinct from A. formosa. 



14. Arenaria ursina Robinson. Bear Valley Sandwort. Fig. 1694. 



Arenaria ursina Robinson, Proc. Amer. Acad. 29: 294. 1894. 



Arenaria capillaris var. ursina Robinson, Syn. Fl. N. Amer. 1 : 240. 1897. 



Cespitose, the caudex branches numerous, erect or ascending, distinctly woody. Leaves 4-6 

 mm. long, straight, subulate, rather stout and rigid, abruptly apiculate, glaucous, ciliolate ; flower- 



