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Boechera laevigata (Muhl. ex Willd. ) Al-Shehbaz
SMOOTH ROCKCRESS
Arabis laevigata

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Boechera laevigata, Smooth Rockcress
© Copyright Sheryl Pollock 2011 · 9
Boechera laevigata, Smooth Rockcress

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Boechera laevigata, Smooth Rockcress
© Copyright Sheryl Pollock 2011 · 8
Boechera laevigata, Smooth Rockcress
Boechera laevigata, Smooth Rockcress
© Copyright Sheryl Pollock 2011 · 8
Boechera laevigata, Smooth Rockcress
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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Boechera laevigata (Muhl. ex Willd.) Al-Shehbaz var. laevigata ( Arabis laevigata var. laevigata ) Smooth Rockcress
Brassicaceae — Mustard family
Rare native
Boechera laevigata var. laevigata
Brandywine Creek State Park
May 2002 Boechera laevigata var. laevigata
Brandywine Creek State Park
May 2004 Boechera laevigata var. laevigata
Brandywine Creek State Park
May 2007

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http://plants.usda.gov/java/profile?symbol=ARLA ---> https://plants.usda.gov/java/profile?symbol=ARLA
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FNA | Family List | FNA Vol. 7 | Brassicaceae | Boechera

50. Boechera laevigata (Muhlenberg ex Willdenow) Al-Shehbaz, Novon. 13: 386. 2003.

Turritis laevigata Muhlenberg ex Willdenow, Sp. Pl. 3: 543. 1801; Arabis hastata Eaton; A. heterophylla Nuttall; A. laevigata (Muhlenberg ex Willdenow) Poiret; A. lyrifolia de Candolle

Biennials; short-lived; sexual; caudex not evident. Stems 1 per plant, arising from center of rosette near ground surface, (1.5-)3-11 dm, glabrous throughout. Basal leaves: blade obovate to oblanceolate, (4-)10-40 mm wide, margins serrate or dentate, ciliate-mucronate on teeth, trichomes often minute, surfaces glabrous or sparsely pubescent, trichomes simple, 0.1-0.6 mm. Cauline leaves: 7-15, often concealing stem proximally; blade auricles 3-12 (-17) mm, surfaces of distalmost leaves glabrous. Racemes 16-45-flowered, sometimes branched. Fruiting pedicels suberect to divaricate-ascending, straight to slightly curved, 5-23 mm, glabrous. Flowers ascending at anthesis; sepals glabrous; petals white, 3-5 × 1-1.5 mm, glabrous; pollen ellipsoid. Fruits divaricate-ascending, not appressed to rachis, rarely somewhat secund, curved, edges parallel, (4-)6-11.7 cm × 1-2 mm; valves glabrous; ovules 50-80 per ovary; style 0.1-0.7(-1) mm. Seeds uniseriate, 1.2-2.2 × 0.8-1.4 mm; wing continuous, 0.1-0.3 mm wide distally. 2 n = 14.

Flowering Mar-May. Rocky bluffs, cedar glades, wooded hillsides, floodplains; 100-500 m; Ont., Que.; Ala., Ark., Conn., Del., D.C., Ga., Ill., Ind., Iowa, Ky., Md., Mass., Mich., Mo., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Vt., Va., W.Va., Wis.

The taxon sometimes treated as Arabis laevigata var. missouriensis is here recognized as a separate species ( Boechera missouriensis ) based on its significantly longer petals (5-10 versus 3-5 mm) and distinctive, lyrate-pinnatifid basal leaves that persist well beyond anthesis.

Updated: 2020-11-26 07:58:27 gmt
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