Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Calif., Nev.
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Physical Description

Morphology

Description

Plants annual, delicate, 6-15 cm, glabrous or stipitate-glandular distally. Taproots filiform. Stems erect to ascending or arcuate-spreading, simple or branched proximally; main stem 0.3-1 mm diam. proximally. Leaves: stipules inconspicuous, dull white to tan, broadly triangular, 1-2.5 mm, apex acute to short-acuminate; blade filiform to linear, 0.5-3.5 cm, fleshy, apex blunt to apiculate; axillary leaf clusters absent. Cymes simple to 2-compound. Pedicels divergently spreading to reflexed in fruit. Flowers: sepals connate 0.2-0.5 mm proximally, lobes ± weakly 1-veined, elliptic to ovate, 1.8-2.7 mm, to 3.5 mm in fruit, margins 0.1-0.5 mm wide, apex broadly acute to rounded; petals white to rosy, ± ovate, 0.7-0.8 times as long as sepals; stamens 4-8; styles 0.4-0.8 mm. Capsules greenish, 3.3-5 mm, 1-1.3 times as long as sepals. Seeds black, often iridescent, submarginal groove usually absent, broadly ovate, compressed, 0.6-0.8 mm, shiny, sculpturing of parallel, wavy lines, not papillate (40×); wing absent or, rarely, incomplete, brownish, 0.1-0.2 mm, margins irregular.
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Type Information

Isotype for Spergularia atrosperma R. Rossbach
Catalog Number: US 1765670
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): J. T. Howell
Year Collected: 1938
Locality: Los Banos Hills., Merced, California, United States, North America
  • Isotype: Rossbach, R. P. 1940. Rhodora. 42: 80.
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Ecology

Habitat

Alkaline places, mud flats, stream beds, sandy places; 30-1500m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering summer.
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Spergularia atrosperma

Spergularia atrosperma is a species of flowering plant in the pink family known by the common name blackseed sandspurry. It is native to California and Nevada, where it grows in muddy and sandy habitat, often in moist alkaline substrates. It is a small annual herb producing a slender stem up to 15 centimeters long. It is lined with fleshy linear leaves. The inflorescence bears small flowers with five pointed sepals and five oval white or pink petals. The fruit is a capsule containing shiny, sometimes iridescent, black seeds.

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