PlantsFlowering PlantsMustard Family — Family Brassicaceae
Shepherd's Purse
Capsella bursa-pastoris
Stinking Wallrocket
Diplotaxis muralis
Ours with alternate leaves. Flowers yellow, white, sometimes lavender (Diplotaxis), or absent. Usually 6 stamens, with 4 long and 2 short (we have one species with 4 stamens).
Observe number of stamens, color and length of petals (if present), whether or not stems have hairs, and shape of fruit.

Petal Color
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Mouseear Cress —  Arabidopsis thaliana [1]
No image available.
Rockcress — Genus Arabis
Cabbage
Mustard — Genus Brassica
No image available.
Searocket — Genus Cakile
Littlepod
False Flax — Genus Camelina
Shepherd's Purse
Shepherd's Purse —  Capsella bursa-pastoris [1,2,3]
Stem leaves simple, usually clasping. Stems with inconspicuous hairs. Petals white or yellowish, 1.7-2.5mm long. 6 stamens. Flowering Feb-May. Pods heart-shaped.
Hairy Bittercress
Bittercress — Genus Cardamine
Upper leaves not clasping. Upper stems hairless, lower stems with or without hairs. Petals white, 1.5-3.5mm long. This is our only Brassicaceae member that might have either 4 or 6 stamens. Flowering Feb-Apr.
No image available.
Whitetop —  Cardaria draba [1]
No image available.
Crossflower —  Chorispora tenella [1]
Petals lavender.
No image available.
Hare's Ear Mustard —  Conringia orientalis [1]
Petals yellow. Leaves clasping.
No image available.
Swinecress — Genus Coronopus
Tansy-mustard
Tansymustard — Genus Descurainia
No image available.
Spectaclepod — Genus Dimorphocarpa
Stinking Wallrocket
Stinking Wallrocket —  Diplotaxis muralis [1,2,3]
Plant smells bad. Leaves crowded near base, toothed or pinnatifid. Upper leaves not clasping. Petals yellow to lavender, 5-8mm. 6 stamens. Flowering Mar-Sep.
No image available.
Perennial Wallrocket —  Diplotaxis tenuifolia [1]
Broad-pod Draba
Draba — Genus Draba
Upper leaves not clasping. Upper stems with hairs. Petals absent or white, 1-4mm long. 6 stamens.
No image available.
Rockmustard —  Dryopetalon runcinatum [1]
No image available.
Rocketsalad —  Eruca vesicaria [1]
No image available.
Common Dogmustard —  Erucastrum gallicum [1]
No image available.
Wallflower — Genus Erysimum
No image available.
Spreading Fissurewort —  Halimolobos diffusa [1]
No image available.
Purplerocket —  Iodanthus pinnatifidus [1]
No image available.
Golden Gladecress —  Leavenworthia aurea [1]
Southern Pepper-grass
Pepper-grass — Genus Lepidium
Leaves alternate. Upper leaves not clasping. Flowers small and white, or petals absent. 6 stamens.
White Bladderpod
Bladderpods — Genus Lesquerella
Flowers yellow, 6 stamens.
No image available.
Sweet Alyssum —  Lobularia maritima [1]
No image available.
African Mustard —  Malcolmia africana [1]
No image available.
Trans-Pecos Cress —  Mancoa pubens [1]
No image available.
Stock — Genus Matthiola
Myagrum
Myagrum —  Myagrum perfoliatum [1,3]
Upper leaves clasping. Stems glabrous. Petals light yellow, 3-4mm long. 6 stamens. Flowering Apr-May.
Watercress
Watercress —  Nasturtium officinale [1,3]
Appears as Rorippa nasturtium-aquaticum on some lists.
No image available.
Lakecress —  Neobeckia aquatica [1]
No image available.
Fanmustard — Genus Nerisyrenia
No image available.
Fendler's Pennycress —  Noccaea fendleri [1]
No image available.
Mock Thelypody — Genus Pennellia
No image available.
Radish — Genus Raphanus
Annual Bastard-cabbage
Annual Bastard-cabbage —  Rapistrum rugosum [1,2,3]
Lower leaves toothed or pinnatifid. Upper leaves not clasping. Petals yellow, 5-10mm long. 6 stamens. Flowering [Mar-]Apr-May.
No image available.
Yellowcress — Genus Rorippa
No image available.
Slimleaf Plainsmustard —  Schoenocrambe linearifolia [1]
No image available.
Selenia — Genus Selenia
No image available.
Winged Rockcress — Genus Sibara
No image available.
Mustard — Genus Sinapis
No image available.
Hedgemustard — Genus Sisymbrium
Petals light yellow.
No image available.
Desert Princesplume —  Stanleya pinnata [1]
No image available.
Twistflower — Genus Streptanthus
No image available.
Gregg's Keelpod —  Synthlipsis greggii [1]
No image available.
Tumblemustard — Genus Thelypodiopsis
No image available.
Thelypody — Genus Thelypodium
No image available.
Field Pennycress —  Thlaspi arvense [1]
Upper leaves clasping. Stems without hairs. Petals white, 2-5mm. 6 stamens. Flowering Mar-May.
Evidence that species is found in Texas:
  1. USDA Plants Database, advanced search for Texas plants from the United States Department of Agriculture.
  2. Atlas of the Vascular Plants of Texas, Volume 1, B.L. Turner, Holly Nichols, Geoffrey Denny and Oded Doron, Botanical Research Institute of Texas (BRIT), Fort Worth, Texas, 2003.
  3. Rick's iNaturalist observations, nature observations of Richard K. Murphy. Identifications are not necessarily confirmed by other users.