146 CARYOPHYLLACEAE 



Plants glabrous throughout. 



Petals about twice the length of the sepals; seeds roughened. 3. A. calif arnica. 



Petals minute or wanting; seeds smooth. 4. A. pusilla. 



Plants, at least the pedicels, more or less glandular-puberulent; sepals very strongly 3-nerved. 



5. A. tenella. 

 Perennials. 



Plants with weak elongated subsimple stems, growing in mud and rooting at the joints. 



6. A. paludicola. 

 Plants tufted, not palustrine. 



Sepals acute or acuminate. 



Leaves pungent, squarrose; sepals 1-nerved or indistinctly 3-nerved. 7. A. Nuttallii. 



Leaves not pungent, mostly erect; sepals strongly 3-nerved. 8. A. propinqua. 



Sepals oblong, rounded at the apex, 3-nerved. 9. A. obtusiloba. 



Valves of the capsule 2-toothed or -cleft. 



Annuals; leaves ovate. 10. A. serpyllifolia. 



Perennials. 



Leaves oblong-linear. 11. A. confusa. 



Leaves subulate. 



Sepals lanceolate -subulate, 5-6 mm. long. 12. A. Franklinii. 



Sepals broadly ovate to ovate-lanceolate. 



Inflorescence loosely cymose, the flowers on more or less elongated pedicels, often solitary in 

 compacta. 

 Flowering stems less than 2 dm. high; sepals 2.5-4 mm. long. 

 Sepals broadly ovate, obtuse or rounded at the apex. 



Leaves 20-30 mm. long, usually curved, not rigid. 13. A. formosa. 



Leaves 5-15 mm. long, abruptly and minutely apiculate, straight and rigid. 



14. A. ursina. 



Sepals narrowly ovate, acute; leaves rather rigid. 



Leaves 10-30 mm. long. 



Leaves not rigidly pungent, ascending. 15. A. pumicola. 



Leaves conspicuously rigidly pungent, and in age widely spreading. 



16. A. aculeata. 



Leaves 3-5 mm. long, rosulate-spreading; flowers usually solitary on the short 

 (2-5 cm.) stems. 17. A. compacta. 



Flowering stems usually 2-3 dm. high; sepals 4-6 mm. long. 18. A. macradenia. 



Inflorescence not cymose; plants glabrous. 



Flowers in small few-flowered glomerules at the ends of the branches, subsessile. 



19. A. Burkei. 

 Flowers capitate or umbellate. 20. A. congesta. 



1. Arenaria Douglasii Fenzl. Douglas' Sandwort. Fig. 1681. 



Arenaria Douglasii Fenzl ex Torr. & Gray, Fl. N. Amer. 1: 674. 1840. 

 Alsinopsis Douglasii Heller, Muhlenbergia 8: 20. 1912. 

 Minuartia Douglasii Mattf. Bot. Jahrb. 57. Beibl. 126: 27. 1921. 



Glabrous or sparsely glandular-pubescent annual, stem slender, much branched, 5-30 cm. 

 high. Leaves filiform, 8-20 mm. long ; flowers many, loosely cymose ; pedicels filiform, 1-3 cm. 

 long; sepals narrowly ovate, with narrow membranous margin, 2.5-3 mm. long, 1 -3-nerved; 

 petals obovate, well exceeding the sepals ; capsule subglobose, slightly exceeding the sepals ; 

 seeds about 1.5 mm. broad, reniform, broadly margined, smooth or with inconspicuous radiating 

 striae. 



Dry sandy or rocky places, Upper Sonoran Zone; Rogue River Valley, Oregon, to northern Lower Califor- 

 nia. Type locality: California, collected by Douglas. April-June. 



2. Arenaria Howellii S. Wats. Howell's Sandwort. Fig. 1682. 



Arenaria Howellii S. Wats. Proc. Amer. Acad. 20: 354. 1885. 

 Alsinopsis Howellii Heller, Muhlenbergia 8: 96. 1912. 

 Minuartia Howellii Mattf. Bot. Jahrb. 57. Beibl. 126: 27. 1921. 



Annual, the stems usually simple below, dichotomously branched above, 15-35 cm. high, more 

 or less glandular-pubescent at least below the nodes. Leaves narrowly linear, 7-15 mm. long, 

 rather thick, widely spreading or those of the stem recurved, glandular-pubescent ; bracts her- 

 baceous, much reduced ; flowers solitary on slender pedicels ; sepals ovate, 3 mm. long, nerveless, 

 glandular ; petals oblong, 4 mm. long ; capsule little exceeding the sepals ; seeds slightly tuberculate- 

 crested. 



Dry rocky or sandy soils, Arid Transition Zone; Josephine County, Oregon, and Del Norte County, California. 

 Type locality: "In the Coast Mountains near Waldo," Oregon. April-June. 



3. Arenaria californica (A. Gray) Brewer. California Sandwort. Fig. 1683. 



Arenaria brevifolia var. californica A. Gray, Proc. Calif. Acad. 3: 101. 1864. 

 Arenaria californica Brewer, Bot. Calif. 1: 69. 1876. 

 Minuartia californica Mattf. Bot. Jahrb. 57. Beibl. 126: 28. 1921. 

 Alsinopsis californica Heller, Muhlenbergia 8: 20. 1912. 



A diminutive glabrous annual, usually much branched from the base, the branches filiform, 

 2.5-10 cm. high. Leaves linear-subulate, somewhat fleshy, 2-4 mm. long, obtuse; sepals oblong- 

 ovate, 2-3 mm. long, with a prominent or obscure midrib ; petals oblong, 3-4 mm. long ; seeds 

 minute, finely roughened. 



Dry ridges in sandy or rocky soils, Upper Sonoran and Transition Zones; Rogue River Valley, Oregon, south 

 in the Coast Ranges and Sierra Nevada to the Tehachapi Mountains, California. Type locality: "In the valleys 

 among high ridges in Sonoma," California. March-May. 



