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large selenia

Habit Plants winter annuals.
Stems

erect to ascending, (slender or stout), 1.5–6.5 dm.

Basal leaves

(soon withered), early rosulate;

petiole 1–4 cm;

blade margins 2- or 3-pinnatisect, 4–15 cm;

lobes 8–16 on each side;

apical segment oblong to ovate, 1–10(–12) × 0.5–2(–3.5) mm, margins entire.

Cauline leaves

(and bracts) similar to basal, smaller distally (lobes fewer).

Flowers

sepals (persistent), erect, oblong-lanceolate, 9–12(–15) × 2–3.5 mm, apex appendage well-developed, (1–)2–4 mm;

petals broadly obovate, 12–15(–20) × (5–)7–11 mm, apex rounded;

median filament pairs 4–6 mm, slightly dilated basally;

anthers linear, 3–4 mm;

gynophore usually obsolete, rarely to 2 mm.

Fruiting pedicels

some from basal rosette (straight or slightly recurved), (30–)50–100(–180) mm.

Fruits

oblong, somewhat inflated, (0.8–)1–2(–2.5) cm × 5.5–7.5 mm, (fleshy green, thick, leathery), base and apex obtuse to subacute;

valves (covered with well-developed vesicles), not veined;

replum rounded;

septum complete;

ovules 16–44 per ovary;

style 2–5(–7) mm, not flattened basally.

Seeds

4–5 mm diam.;

wing 1–1.5 mm.

2n

= 24.

Selenia grandis

Phenology Flowering Dec–Mar.
Habitat Open grounds, fields, flood plains, roadsides, slightly saline alluvial silt, ditch banks
Elevation 0-100 m (0-300 ft)
Distribution
from FNA
TX
[BONAP county map]
Discussion

Selenia grandis, which is restricted to the lower valley of the Rio Grande, is easily distinguished from other species of the genus by the presence of vesicles on fruits and by the persistent sepals.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 508.
Parent taxa Brassicaceae > tribe Cardamineae > Selenia
Sibling taxa
S. aurea, S. dissecta, S. jonesii
Synonyms S. oinosepala
Name authority R. F. Martin: Rhodora 40: 183. (1938)
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