Flora of North America species comparison

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Arabis georgiana

Georgia rockcress
Habit Biennials; sparsely to moderately hirsute (at least basally), trichomes simple, mixed with fewer, short-stalked, forked ones, subsessile cruciform or 3-rayed stellate trichomes commonly on abaxial blade surfaces, sometimes plants glabrous distally.
Stems

simple or few from base (rosette), erect, unbranched or branched (few) distally, 3–7 dm, (hirsute basally, glabrous distally).
Basal leaves

petiole 0.5–2 cm, (ciliate or not);

blade spatulate, oblanceolate, or obovate, 1.5–6 cm × 5–15 mm, margins dentate, apex obtuse or acute, abaxial surface moderately to sparsely pubescent, trichomes subsessile stellate, adaxial surface subglabrate or sparsely stellate.
Cauline leaves

7–26;

blade oblong, lanceolate, or linear-lanceolate, 1.5–7 cm × 3–18 mm, base auriculate to subamplexicaul, margins dentate or entire, apex acute or obtuse, pubescent as basal leaves except distalmost leaves often glabrous.
Racemes

often simple.
Flowers

sepals oblong, 2.5–4.5 × 1–1.5 mm, lateral pair subsaccate basally;

petals white, narrowly spatulate or oblanceolate, 6–9 × 1–1.5 mm, apex obtuse;

filaments 3–4.5 mm;

anthers oblong, 0.8–1 mm.
Fruiting pedicels

erect to erect-ascending, 7–16 mm, (glabrous).
Fruits

erect to erect-ascending, (often subappressed to rachis), smooth, 4–7 cm × 0.7–0.8 mm;

valves each with midvein extending full length or to middle;

ovules 38–44 per ovary;

style 0.7–1.8 mm.
Seeds

narrowly winged throughout, oblong, 0.9–1.9 × 0.5–0.7 mm;

wing to 0.1 mm wide distally.

Arabis georgiana
Phenology Flowering Mar–Apr.
Habitat Stream banks, roadsides
Elevation 0-200 m (0-700 ft)
Distribution
from FNA
AL; GA
[BONAP county map]
Discussion

Of conservation concern.

Arabis georgiana is most closely related to A. pycnocarpa, from which it is easily distinguished by having narrower fruits, longer petals, and subsessile cruciform or 3-rayed trichomes on abaxial surfaces of basal leaves. It is known only in Alabama from Bibb and Elmore counties and in Georgia from Stewart County.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 261.
Parent taxa Brassicaceae > tribe Arabideae > Arabis
Sibling taxa
A. aculeolata, A. alpina, A. blepharophylla, A. caucasica, A. crucisetosa, A. eschscholtziana, A. furcata, A. mcdonaldiana, A. modesta, A. nuttallii, A. olympica, A. oregana, A. patens, A. pycnocarpa
Name authority R. M. Harper: Torreya 3: 88. (1903)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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