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Oenothera falfurriae

Distribution: Open sandy sites in southeastern Texas.

Habit: Erect to decumbent annual herbs, forming rosettes with only a few leaves; stems 10-40 cm long, usually simple, moderately to sparsely strigillose, villous, sometimes also glandular-puberulent.

Leaves: Leaves alternate, in a rosette and cauline, leaves and bracts moderately to sparsely villous and glandular-puberulent primarily on the midrib of the lower surface and along the margin, usually also sparsely to moderately strigillose, rosette leaves 5-12 cm long, 1.3-3.5 cm wide, oblanceolate, deeply lobed to dentate or sometimes some of them subentire, apex acute, gradually narrowed to a short petiole, cauline leaves 2-8.5 cm long, 1-3 cm wide, narrowly oblanceolate to elliptic or narrowly lanceolate, usually dentate, occasionally pinnatifid or subentire, apex acute, gradually narrowed to subsessile base, bracts 2-4.5 cm long, 0.5-2.5 cm wide, spreading, elliptic, narrowly ovate to lanceolate, flat, dentate or subentire to pinnately lobed, narrowed to the base, subsessile.

Flowers: Inflorescence lax, simple or with lateral branches. Usually only one flower per spike opening each day near sunset, erect at anthesis, floral tube 25-40 mm long, densely to sparsely villous and glandular-puberulent, mature buds 4-6 mm in diameter at the base, narrowly oblong to oblong, rarely lanceoloid, sepals 10-22 mm long, green to greenish yellow, sometimes with red spots, pubescence same as the floral tube, sepal tips 0.5-2 mm long, erect in bud, strigillose and villous, petals 13-25 mm long, 14-27 mm wide, yellow, broadly obovate, apex truncate to slightly retuse, staminal filaments 10-17 mm long, anthers 4-5 mm long, ovary 10-17 mm long, ca. 1.5 mm in diameter, densely villous, strigillose, and glandular-puberulent, style 35-50 mm long, the exserted part 12-20 (-25) mm long, stigma usually slightly elevated above the anthers at anthesis, lobes 3-7 mm long.

Fruit: Capsule dehiscent 20-45 mm long, 2-2.5 mm in diameter, cylindrical, subterete, dehiscent nearly throughout capsule length, sessile.

Seeds: Seeds numerous, in 2 rows per locule, 0.8-1.4 mm long, 0.3-0.6 mm in diameter, ellipsoid, brown, the surface reticulate and regularly pitted.

Chromosomes: Chromosome number: n = 7 (7II* at meiotic metaphase I).

Notes: FNA, Self-compatible, modally autogamous.

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