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Thelypodiopsis shinnersii
(M.C. Johnst.) Rollins
No occurrences found
Family:
Brassicaceae
Rio Grande tumblemustard
[
Sisymbrium shinnersii
M.C. Johnst.,
more
Thelypodium shinnersii
(M.C. Johnst.) Rollins
]
Images
not available
FNA
Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
Annuals;
(often glaucous), glabrous throughout.
Stems
unbranched or branched distally, 3.5-8 dm.
Basal leaves
(soon withered); not rosulate; petiole (winged), 0.5-3.5 cm; blade pandurate to broadly obovate, 2-10 cm × 10-50 mm, margins entire or repand.
Cauline leaves
(proximalmost) petiolate or (distal) sessile; blade (proximalmost) pandurate to broadly obovate or (distal) obovate, base auriculate, margins entire or repand.
Racemes
lax.
Fruiting pedicels
often divaricate, sometimes ascending, straight, 4-13 mm.
Flowers:
sepals erect, purplish, 2.5-3.5 × 0.7-1 mm; petals white, narrowly oblanceolate, 3.5-4.5 × 1-1.2 mm, claw not developed; median filament pairs 1.5-2.5 mm; anthers ovate-oblong, 0.7-1 mm; gynophore 0.2-0.4 mm.
Fruits
divaricate to ascending, straight or curved, obscurely torulose, 3.2-7.5 cm × 0.9-1.2 mm; ovules 60-102 per ovary; style subclavate, 0.4-2.5 mm; stigma entire.
Seeds
0.9-1.1 × 0.5-0.7 mm. Flowering Apr-Oct. Canyon sides, rocky arroyo floors, chaparral thickets, scrubs, dry banks; Tex.; Mexico (Tamaulipas).
Thelypodiopsis shinnersii
is known from Cameron County.
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