Gratiola amphiantha
pool sprite, snorkelwort
erect, simple or few-branched, (7–)9–21(–29) cm, glabrous or glabrate proximally, glabrate or glandular-puberulent distally.
dimorphic, submersed basal and clustered, floating paired at ends of branches to 70 mm, blade of submersed lanceolate to oblanceolate or oblong, 1–7 × 0.5–3 mm, margins entire, apex obtuse to acute, surfaces glabrous, blade of floating elliptic to ovate or nearly round, 3–10 × 2–9 mm, margins entire, apex obtuse to rounded or retuse, surfaces glabrous.
stout, 0.1–3 mm, length less than 0.1 times bract, glabrous;
bracteoles 0.
sepals connate proximally, calyx lobes obovate to oblong, 0.7–1 mm;
corolla 3–4 mm, tube and limb white tinged pink or purple, veins lavender or purple;
style 0.5–1 mm.
bilaterally symmetric, obcordiform, 2–3 × 3–4 mm.
(0.3–)0.4–0.5 mm.
= 18.
Gratiola amphiantha
Phylogenetic studies confirmed that Gratiola amphiantha, long treated in monospecific Amphianthus, is embedded in Gratiola (D. Estes and R. L. Small 2008). Gratiola amphiantha is listed as a federally-threatened species by the United States Fish and Wildlife Service.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
WildflowerSearch
iNaturalist
USDA Plants Database
