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FNA | Family List | FNA Vol. 5 | Caryophyllaceae | Paronychia

12. Paronychia fastigiata (Rafinesque) Fernald, Rhodora. 38: 421. 1936.

Hairy forked nailwort, forked-chickweed

Anychia fastigiata Rafinesque, Atlantic J. 1: 16. 1832

Plants annual; taproot filiform to slender. Stems erect, usually much-branched, 4-30 cm, retrorsely to spreading-pubescent mostly on 1 side. Leaves: stipules subulate to lanceolate, 0.5-4.5 mm, apex acuminate, sometimes fimbriate; blade usually dotted or blotched, oblanceolate to elliptic or obovate, 2-25 × 0.5-7(-10) mm, herbaceous to leathery, apex subobtuse to acute or cuspidate, glabrous or occasionally with very few scattered trichomes along midrib. Cymes terminal, 25-70+-flowered, branched, loose to compact, forming clusters 3-10 mm wide. Flowers 5-merous, short-cylindric, with enlarged hypanthium and calyx ± cylindric, 1.1-1.6 mm, glabrous or with few scattered hairs; sepals greenish to brownish, veins absent, linear-oblong, 1-1.2 mm, leathery to rigid, margins white to translucent, 0.05-0.1 mm wide, scarious, apex terminated by mucro, hood narrowly rounded, mucro short-conic, 0.05-0.3 mm, ± minutely scabrous; staminodes absent; styles 2, 0.07-0.6(-0.7) mm. Utricles obovoid to obconic, 0.7-1 mm, minutely papillate. 2n = 32, 36.

Varieties 3 (3 in the flora): e North America.

The varieties here recognized are sympatric over at least portions of their ranges. A detailed study on infraspecific variation within Paronychia fastigiata is warranted.

1 Styles 0.3-0.6(-0.7) mm, often bent or contorted   12c var. pumila
+ Styles 0.07-0.25(-0.3) mm, straight   (2)
2 (1) Sepal cusps 0.2-0.3 mm   12b var. nuttallii
+ Sepal cusps 0.05-0.15 mm   12a var. fastigiata


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