Ludwigia glandulosa subsp. brachycarpac.
rarely reddish green, 10–55(–90) cm.
petiole 0–1 cm, blades linear-elliptic to linear, sometimes very narrowly elliptic, those on main axis 3–5(–7) × 0.3–0.5(–1) cm, those on branches 0.8–3.6 × 0.2–0.3(–0.8) cm.
brac-teoles attached at base of ovary, 0.4–0.8 × 0.1–0.2 mm.
sepals 1.1–1.9 × 1–1.8 mm, apex acute or short-acuminate;
nectary disc obscurely, minutely papillose;
style 0.4–0.8 mm, stigma 0.2–0.3 mm diam.
obscurely 4-angled, 2–5 × 1.3–2 mm, pedicel 0–0.2 mm.
0.6–0.8 × 0.3–0.4 mm, surface cells elongate transversely to seed length.
Ludwigia glandulosa subsp. brachycarpac.
Subspecies brachycarpa grows along the Gulf Coast from southwestern Louisiana to Nueces County, Texas, and more sporadically northward in eastern Texas to south-central Oklahoma.
Subspecies brachycarpa was published initially by Peng as a new combination based on Ludwigia cylindrica var. brachycarpa Torrey & A. Gray, not realizing that the variety was based on Jussiaea brachycarpa Lamarck, which Peng considered to be a synonym of L. glandulosa subsp. glandulosa. Therefore, subsp. brachycarpa is a new subspecies but was invalid when published by Peng since it was not accompanied by a Latin description in 1986; that situation has since been remedied.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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