Herbs annual, (2-)5-30(-50) cm tall. Stems erect, 1 or few from base, simple or branched above, basally with predominantly simple trichomes, apically glabrous. Basal leaves shortly petiolate; leaf blade obovate, spatulate, ovate, or elliptic, 0.8-3.5(-4.5) cm × (1-)2-10(-15) mm, adaxially with predominantly simple and stalked 1-forked trichomes, margin entire, repand, or dentate, apex obtuse. Cauline leaves subsessile, usually few; blade lanceolate, linear, oblong, or elliptic, (0.4-)0.6-1.8(-2.5) cm × 1-6(-10) mm, entire or rarely few toothed. Fruiting pedicels slender, divaricate, straight, 3-10(-15) mm. Sepals 1-2(-2.5) mm, glabrous or distally sparsely pubescent with simple trichomes, lateral pair not saccate. Petals white, spatulate, 2-3.5 × 0.5-1.5 mm, base attenuate to a short claw. Filaments white, 1.5-2 mm. Ovules 40-70 per ovary. Siliques linear, terete, smooth, (0.8-)1-1.5(-1.8) cm × 0.5-0.8 mm; valves with a distinct midvein; style to 0.5 mm. Seeds ellipsoid, plump, light brown, 0.3-0.5 mm; cotyledons incumbent. Fl. and fr. Jan-Jun(-Oct). 2n = 10*.
Annuals; glabrous or pubescent, trichomes usually simple, sometimes mixed with stalked, forked ones. Stems simple or few from base, erect, unbranched or branched distally, (0.2-)0.5-3(-5) dm, pubescent basally, trichomes predominantly simple, glabrous apically. Basal leaves shortly petiolate; blades obovate, spatulate, ovate, or elliptic, 0.8-3.5(-4.5) cm × (1-)2-10(-15) mm, margins entire, repand, or dentate, apex obtuse, adaxial surface with predominantly simple and stalked, 1-forked trichomes. Cauline leaves subsessile; blade lanceolate, linear, oblong, or elliptic, (0.4-)0.6-1.8(-2.5) cm × 1-6(-10) mm, margins usually entire, rarely toothed. Fruiting pedicels divaricate, 3-10(-15) mm. Flowers: sepals 1-2(-2.5) mm, lateral pair not saccate basally, (glabrous or sparsely pubescent distally, trichomes simple); petals white, spatulate, 2-3.5(-4) × 0.5-1.5 mm, (base attenuate to claw); filaments 1.5-2 mm. Fruits cylindric or linear, smooth, terete, (0.8-) 1-1.5(-1.8) cm × 0.5-0.8 mm; valves each with distinct midvein; ovules 40-70 per ovary; style to 0.5 mm. Seeds light brown, (plump), ellipsoid 0.3-0.5 mm; cotyledons incumbent. 2n = 10.
"Annual or winter-annual 1–4 dm; lvs chiefly in a basal rosette, oblong to spatulate, 1–5 cm, stellate-hairy; cauline lvs smaller, linear to narrowly oblong; sep pilose; pet 2–3 mm; mature racemes very open, the widely divergent pedicels 5–10 mm; frs divergent or ascending, 1–2 cm × 1 mm; 2n=10. Native of Europe, naturalized in fields and waste places, especially in sandy soil, throughout most of the U.S. Apr.–June. (Sisymbrium t.)"
Annual, 5-20 (-45) cm tall, erect, simple or branched, usually from the base, often hairy below and suhglabrous above with short, branched or simple hairs. Basal leaves rosulate, obovate-oblong, 15-50 mm long, 5-10 mm broad, subsessile, slightly to distinctly toothed or entire; upper leaves, short, distant, oblong or linear, cuneate below. sessile. entire or obscurely toothed. Racemes (8-) 15-30 (-40)-flowered, up to 20 cm long in fruit. Flowers 2-3 mm across, white or pale pinkish; pedicels (5-) 8-15 mm long in fruit, filiform, subspreading or ascending. Sepals 1.5-2 mm long. Petals 3-4 mm long, 1 mm broad. Stamens 6 or 4, c. 1.5: 2.5 mm long (outer 2 sometimes suppressed) ; anthers c. 0.5 mm long. Siliquae (10-) 12-18 mm long, 1 mm broad, linear, subcylindrical, often somewhat upcurved, glabrous; valves 1-veined; stigma short, depressed, sub-sessile or on c. 0.5 mm long style; septum not veined; seeds usually 20-30 in each locule, c. 0.5 mm long.
Sepals green with narrow white margins, oblong, 1–2.2 mm. long, sparsely hairy.
Racemes ebracteate, densely corymbose, with normally 15–30 flowers, in fruit elongate, rather dense, usually up to 6 (rarely 15) cm. long; pedicels spreading to divaricate, 0.4–0.9 cm. long.
Short-lived herb, usually profusely branched from the base and with a rather dense leaf-rosette (lacking in old specimens).
Basal leaves spathulate, obtuse, attenuate and indistinctly petioled, entire or serrulate, 0.5–4 cm. long, 0.3–1.5 cm. broad; cauline leaves few, sessile, elliptic to obovate, rather acute, cuneate, entire or sparsely dentate, 0.5–1.5 cm. long, 0.2–1 cm. broad; all leaves with sparse to dense stellate and simple hairs above, nearly glabrous beneath.
Stems erect to ascending, little or not branched, moderately covered by stellate to simple hairs, 1–10(–25) cm. high, in flower often overtopped by the leaf-rosette.
Petals white, spathulate with rounded apex, exceeding the sepals, 1.8–3.2 mm. long.
Stamens 6; anthers rounded, ± 0.3 mm. long.
Siliqua linear, somewhat dorsi-ventrally compressed and with a narrow septum, straight or slightly curved, 6–10(–20) mm. long, ± 0.7 mm. broad; style ± 0.3 mm. long, ± 0.2 mm. broad.
Seeds reddish brown, elliptic to ovate in outline, ± 0.7 mm. long, ± 0.4 mm. broad, minutely colliculate.
5–40 cm hoch, oft verzweigt, unten rauhaarig. Grundständige Blätter in einer Rosette, oval, meist ganzrandig, bis 3 cm lang, besonders auf der Unterseite mit 2strahligen Haaren. Kronblätter 2–4 mm lang, weiss. Früchte 1–2 cm lang, sch
Slender annual or biennial herbs 5-25 cm high; lower part of stem densely puberulous with spreading simple hairs and sometimes with some branched hairs; upper part of stem glabrous or sparsely puberulous. Leaves mostly crowded into a rosette, 1-4 cm long, obovate to oblanceolate, entire or weakly dentate, petiolate; petiole with mostly simple hairs, blade on both surfaces scabro-puberulous with branched hairs; stem leaves few and small, sessile, lanceolate or narrowly oblong, usually entire, glabrous or sparsely puberulous. Raceme dense in flower, lax in fruit. Pedicels 0.5-1.2 cm long in fruit, slender, ascending or wide-spreading. Siliquae 1-2 cm long, 0.6-0.8 mm broad, linear; valves rounded on the back, 1-nerved; style very short. Seeds c.0.5 mm long, oblong, brown.
|Arabette de Thalius||French||CH|