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Spergularia diandra Boiss.  
Family: Caryophyllaceae
Alkali Sandspurry
[Spergula diandra, moreSpergularia salsuginea Fenzl, Spergularia salsuginea var. bracteata B.L. Rob.]
Spergularia diandra image
  • FNA
  • Gleason & Cronquist
  • Resources
Richard K. Rabeler, Ronald L. Hartman in Flora of North America (vol. 5)
Plants annual, delicate, 5-15 cm, stipitate-glandular throughout or nearly so. Taproots slender. Stems erect to diffusely spreading, much-branched proximally and distally; main stem 0.3-0.7 mm diam. proximally. Leaves: stipules inconspicuous, silvery to dull tan, broadly triangular, 1.5-2 mm, apex acuminate; blade linear, 0.6-2.3 cm, somewhat fleshy, apex blunt to apiculate; axillary leaf cluster usually absent. Cymes simple but commonly 4-8+-compound. Pedicels erect to reflexed in fruit. Flowers: sepals connate 0.2-0.5 mm proximally, lobes 1-veined or not, lanceolate to ovate, 2.3-3.1 mm, enlarging little in fruit, margins 0.1-0.3 mm wide, apex obtuse to rounded; petals white, elliptic to ovate, 0.7-0.8 times sepals; stamens 4-7; styles 0.4-0.6 mm. Capsules greenish tan, 2.5-2.8 mm, 0.9-1.2 times sepals. Seeds black, often with silvery, not iridescent tinge, with submarginal groove, pyriform, somewhat compressed, 0.4-0.6 mm, shiny, sculpturing of low, elongate tubercles, not papillate (40×); wing absent. 2n = 18 (Europe).

Flowering spring-fall. Sandy beaches, river shores; 600-700 m; introduced; Alta., B.C., Sask.; Idaho, Mass., Oreg., Wash.; Europe (Mediterranean region); sw, c Asia; n Africa; introduced in Australia.

R. P. Rossbach's (1940) report of Spergularia diandra from Georgia is referred to 9. S. echinosperma.

The name Spergularia diandra was effectively and validly published via an autographic label distributed in 1851, predating the other commonly seen attributions of this combination.

Vascular plants of NE US and adjacent Canada
A European sp. with black, wingless seeds 0.4-0.5 mm, has been reported from the coast of Mass. All our other spp. have brown seeds.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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