CHICKWEED FAMILY 151 



ing stems 6-15 cm. high, glandular-puberulent above ; cymes loose, few-flowered, pedicels 5-20 

 mm. long; sepals broadly oval, 3-4 mm. long, rounded at the apex, broadly scarious-margined, 

 nerveless, glandular-puberulent; petals slightly exceeding the sepals. 



Dry hillsides, Arid Transition Zone; known only from Bear Valley, San Bernardino Mountains, California. 

 June-Aug. 



15. Arenaria pumicola Cov. & Leib. Pumice Sandwort. Fig. 1695. 



Arenaria pumicola Cov. & Leib. Proc. Biol. Soc. Wash. 11: 169. 1897. 



Cespitose, with a much branched woody caudex. Leaves filiform, 2-5 cm. long, usually ciliate 

 on the margins, at least below, otherwise glabrous or sparsely and minutely glandular, obtuse or 

 rarely abruptly apiculate, but not pungent ; flowering stems 8-20 cm. high, glabrous below, glandu- 

 lar above, bearing 1-3 pairs of leaves; cymes open, few- to many-flowered; pedicels 10-25 mm. 

 long; sepals ovate, broadly acute or obtuse, 3.5-4 mm. long, scarious-margined, 1 -nerved, usually 

 glandular-pubescent on the midrib ; petals 6 mm. long. 



Granitic or volcanic sands, mainly Canadian Zone; Cascade Mountains, central Oregon, to the southern 

 Sierra Nevada, California. Type locality: Crater Lake, Oregon. July-Aug. 



16. Arenaria aculeata S. Wats. Spiny Sandwort. Fig. 1696. 



Arenaria aculeata S. Wats. Bot. King Expl. 40. 1871. 



Arenaria congesta var. aculeata M. E. Jones, Proc. Calif. Acad. II. 5: 626. 1895. 



Arenaria Kuschei Eastw. Proc. Calif. Acad. IV. 20: 140. 1931. 



Plants perennial with a cespitose woody caudex, the flowering stems 1-2 dm. high, glabrous 

 or sparingly glandular above, bearing 1 or 2 pairs of leaves. Basal leaves rigidly spreading and 

 pungent, glabrous and glaucous ; bracts of the inflorescence small, mostly scarious ; pedicels 

 slender, 8-15 mm. long, more or less glandular; sepals ovate, acute, 4 mm. long; petals 5-6 mm. 

 long ; capsule usually about twice as long as the sepals. 



Dry mountain ranges, Arid Transition Zone; Great Basin region, extending from eastern Oregon and central 

 Idaho south, east of the Sierra Nevada, to the Mojave Desert, California, and Arizona. Type locality: Fremont's 

 Pass, East Humboldt Mountains, Nevada, 6,500 feet altitude. June-Aug. 



Arenaria uintahensis A. Nels. Bull. Torrey Club 26: 7. 1899. This species is closely related to A. aculeata 

 and perhaps not specifically distinct. The leaves are similar, being rigidly pungent, but less spreading; capsules 

 but little exceeding the sepals. It also belongs to the Great Basin region extending from eastern Oregon to Wyo- 

 ming and Nevada. Type locality: on higher bluffs overlooking Bear River, Cokeville, Uintah County, Wyoming. 



17. Arenaria compacta Coville. Compact Sandwort. Fig. 1697. 



Arenaria compacta Coville, Proc. Biol. Soc. Wash. 7: 67. 1892. 



Perennial with a thick woody much branched caudex forming a dense mat only 1 or 2 cm. 

 high, flowering stems usually with only 1 pair of leaves, 2-6 cm. high, glandular-pubescent. 

 Leaves subulate, squarrose and pungent, 3-6 mm. long, glandular-ciliolate ; flowers solitary, ter- 

 minating the simple stems, or in few-flowered cymes; sepals 2.5-3.5 mm. long, ovate-lanceolate, 

 scarious-margined, acute ; petals oblong-lanceolate, 3-4 mm. long. 



Dry alpine ridges, Boreal Zones; Sierra Nevada, California, to Utah. Type locality: "at timber-line on a 

 divide northwest of Whitney Meadows, Sierra Nevada, Tulare County, California." July-Aug. 



18. Arenaria macradenia S. Wats. Mojave Sandwort. Fig. 1698. 



Arenaria macradenia S. Wats. Proc. Amer. Acad. 17: 367. 1882. 



Arenaria congesta var. macradenia M. E. Jones, Proc. Calif. Acad. II. 5: 626. 1895. 



Caudex well branched, the branches woody, stout, mostly prostrate or decumbent, 10-25 cm. 

 long, mostly devoid of short sterile leafy stems ; flowering stems 2-4 dm. high, glabrous, bearing 

 many pairs of leaves, usually enlarged at the nodes. Leaves rather stout, subulate, 2-5 cm. long, 

 ascending, or somewhat recurved-spreading, rigid and pungent, scabrous-ciliolate on the margins ; 

 inflorescence an open cyme with few ascending branches, glabrous ; sepals ovate-lanceolate, 5-6 

 mm. long, firm, green, with rather narrow scarious margins, sharply short-acuminate; petals 

 oblong, well exserted ; stamineal glands well developed. 



Dry mountain slopes, Arid Transition and Upper Sonoran Zones; southern Sierra Nevada, and the desert 

 slopes of Los Angeles and San Bernardino Counties, California. Type locality: near the Mojave River. May- 

 July. 



Arenaria macradenia var. Parishiorum Robinson, Proc. Amer. Acad. 29: 296. 1894. Leaves chiefly basal; 

 flowering stems with more elongated internodes, glabrous or sometimes glandular; petals distinctly shorter than 

 the sepals; stamineal glands larger. Desert slopes of the San Bernardino Mountains and the Providence Moun- 

 tains, California. Type locality: desert slopes of the San Bernardino Mountains. 



Arenaria macradenia subsp. Ferrisiae Abrams. Inflorescence cymosely branched, the branches and pedicels 

 very slender, spreading, almost divaricate, sparsely glandular-puberulent or glabrous; sepals 3.5-4 mm. long, the 

 petals about a third longer. 



Inflorescentia cymosa; rami et pedicelli graciles, patuli fere divaricati, sparsim glandulo-puberulentes vel 

 glabri; sepala 3.5—4 mm. longa, petala paulo longioria. 



Southern Sierra Nevada, mainly on the eastern slopes, Kern and Inyo Counties, California. Type, trail to 

 Big Pine Lakes, along north fork of Big Pine Creek, elevation 9,000-9,500 feet, Inyo County, Roxana S. Ferris 

 9,000 (no. 230580 Dudley Herbarium). 



19. Arenaria Burkei Howell. Burke's Sandwort. Fig. 1699. 



Arenaria Fendleri var. subcemgesta S. Wats. Bot. King Expl. 40. 1871. 

 Arenaria congesta var. subcongesta S. Wats. Bot. Calif. 1 : 69. 1876. 

 Arenaria Burkei Howell, El. N.W. Amer. 1 : 85. 1897. 

 Arenaria glabrescens Piper, Contr. U.S. Nat. Herb. 11 : 261. 1916. 



Plants cespitose with a woody caudex; flowering stems 10-15 cm. high, glabrous or usually 



