Spergularia
See list of 3 species in this genusRossbach (1940) ambiguously reported Spergularia diandra (Guss.) Boiss. from MA based on the following collection— Cushman 8512 ( NEBC!). The same specimen bears a 1937 annotation by Rossbach indicating the collection may be S. purpurea (Pers.) D. Don (i.e., the annotation bears a question mark indicating uncertainty in the determination). Examination of the specimen revealed it is likely neither of these species. It was originally determined as S. atheniensis Heldr. & Sart. ex Nyman (a taxonomic synonym of S. bocconii (Scheele) Asch. & Graeb.). It is very close to that taxon but has very dark seeds. Unfortunately, the specimen’s identity remains a question. Spergularia media (L.) C. Presl has been reported from New England by several sources; however, the specimen (at NEBC!) is Stellaria media and has been determined as such since 1898. References: Rossbach (1940), Hartman and Rabeler (2005b).
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1a. Seeds 0.4–0.6 mm long, without an equatorial wing; flowers with 6–10 stamens [Fig. 577]; plants with evident fascicles of leaves in the axils
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1b. Seeds 0.6–1.4 mm long, with or without an equatorial wing; flowers with (1–) 2–4 (–5) stamens; plants without fascicles of leaves in the axils or these sparse and poorly developed
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2a. Leaf blades obtuse to acute at the apex, but without a minute mucro; seeds 0.8–1.4 mm long, shiny, smooth or with irregular reticulate thickenings on the faces, usually with a ± white, erose, equatorial wing 0.2–0.3 mm wide [Fig. 575]; stipules 1–2.8 mm long; pedicels and sepals usually glabrous
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2b. Leaf blades minutely mucronate at the apex; seeds 0.6–0.8 mm long, dull, smooth or minutely glandular-papillose on the faces, usually unwinged [Fig. 576]; stipules 2–4 mm long; pedicels and sepals usually stipitate-glandular
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Each photo represents one species in this genus.