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No key was found for the requested taxon, but it is the only child of Drymaria. Showing where it is keyed below.

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Key to Caryophyllaceae

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1 Leaves not accompanied by stipules (stipules absent).
..2 Sepals fused into a toothed or lobed tube
..2 Sepals distinct, or slightly fused at their bases
1 Leaves accompanied by stipules (stipules present), these scarious or hyaline and readily apparent.
....3 Fruit a utricle; seed 1 per fruit; petals absent.
......4 Leaves alternate; staminodes petaloid, ovate to oblong; [tribe Corrigioleae]
......4 Leaves opposite (or the uppermost alternate in Herniaria); staminodes not petaloid, subulate; [tribe Paronychieae].
........5 Stipules inconspicuous; sepals green-margined, obtuse, lacking awns
........5 Stipules usually conspicuous; sepals white-scarious-margined, hooded or awned
....3 Fruit a capsule; seeds 3-many per fruit; petals present.
..........6 Stem leaves subulate, 1-2 mm long, pectinate-fringed at the base; basal rosette leaves spatulate (usually withering quickly after overwintering; stems wiry, stiff, subdichotomously branched; [of xeric sands on the Coastal Plain from se. VA southward]
..........6 Stem leaves larger, mostly both longer and broader, not pectinate-fringed at the base; basal rosette present or absent; stems either thicker, more flexuous, or not subdichotomously branched; [collectively more widespread].
............ 7 Leaves appearing verticillate, 10-16 per node, filiform to linear; [tribe Spergulaeae]
............ 7 Leaves opposite or in whorls of 4, linear to ovate or spatulate.
............ ..8 Leaves mostly in whorls of 4, obovate-spatulate, 2-8 mm long; [tribe Polycarpaeae]
............ ..8 Leaves opposite, linear or orbicular, 5-40 mm long.
............ ....9 Leaves orbicular-ovate; styles partly united; [tribe Polycarpaeae]
............ ....9 Leaves linear; styles separate; [tribe Spergulaeae]