Crater Lake sandwort

Arenaria pumicola Coville & Leiberg, Proc. Biol. Soc. Wash. 11: 169. 1897

Plants tufted, green, not glaucous, slightly woody at base. Stems erect, 10-20 cm, stipitate-glandular. Leaves: basal leaves ± deciduous; cauline leaves (2-)3-5 of equal size distally; basal blades ascending to ± spreading, narrowly linear, 1.5-3.5 cm × 1-1.5 mm, ± flexuous, ± succulent, apex green, blunt or acute to apiculate, glabrous, not glaucous. Inflorescences 7-40+-flowered, ± open cymes. Pedicels 3-20 mm, stipitate-glandular. Flowers: sepals 1-3-veined, lateral pair obscure, ovate, 3-3.8 mm, 4-4.5 mm in fruit, margins broad, apex obtuse to rounded or barely acute, stipitate-glandular; petals white, narrowly spatulate, 6.6-7.5 mm, 2 times as long as sepals, apex rounded or emarginate; nectaries as lateral and abaxial rounding of base of filaments opposite sepals, 0.3 mm. Capsules 4.5-5.5 mm, glabrous. Seeds black to brown, oblong to pyriform, 1.8-2.4 mm, smooth to tuberculate.

Flowering summer. Areas with loose pumice; 1600-2800 m; Oreg.

Eremogone pumicola is restricted to Crater Lake and vicinity, southwestern Oregon.