Borodinia laevigata (Muhl. ex Willd.) P. J. Alexander & Windham (redirected from: Arabis laevigata)
Notes: Trópicos
Family: Brassicaceae
Smooth False Rockcress,  more...
[Arabis heterophylla Nutt.,  more]
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Paul Rothrock  
From Flora of Indiana (1940) by Charles C. Deam
Frequent but never common throughout the state. It prefers a rather sandy or gravelly soil and is restricted to the wooded slopes and high banks of streams. The leaves of this species are variable and one form has been named. I am including it under the species.

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Indiana Coefficient of Conservatism: C = 5

Wetland Indicator Status: n/a

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. 2n = 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.

Biennial herb to 1 m tall Stem: upright, unbranched or sparingly branched, with a waxy coating (glaucous). Flowers: in branched, drooping clusters, white or yellowish white, 3 - 6 mm long, barely exceeding sepals. Petals four. Stamens six. Fruit: a narrow pod, widely spreading, drooping or hanging downward, 5 - 10 cm long, 1.2 - 2 mm wide, on a 7 - 12 mm long stalk, flat, very curved. Seeds in one row, oblong, narrowly winged. Basal leaves: in a weak rosette, stalked, spatula-shaped, base tapering, tip rounded, sparsely toothed, sparsely hairy, with a waxy coating (glaucous). Stem leaves: alternate, stalkless, clasping stem, 5 - 15 cm long, narrowly lance-shaped, base lobed, sometimes toothed, with a waxy coating (glaucous). On average there are about thirteen leaves below the first cluster of flowers.

Similar species: The similar Boechera drummondii differs by having pods that are strongly upright at maturity. Boechera missouriensis differs in having petals that are half again as long as the sepals.

Flowering: late April to early August

Habitat and ecology: Fairly common in calcareous soils on shaded banks, usually in moist woods or more rocky areas.

Occurence in the Chicago region: native

Notes: Boechera laevigata gets the common name Smooth Bank Cress from growing on eroded banks.

Etymology: Boechera refers to the Danish botanist, Tyge Bocher. Laevigata means smooth.

Author: The Morton Arboretum

Biennial to 1 m, simple or few-branched, glabrous and glaucous throughout, except the sparsely hirsutulous, spatulate basal lvs; cauline lvs (averaging ca 13 below the first fl) narrowly lanceolate, 5-15 cm, serrate to entire, usually sagittate at the sessile base; cal 3-5 mm; pet white, 3-6 mm, equaling to a fourth longer than the sep; pedicels at maturity widely spreading, 7-12 mm; frs widely spreading to somewhat decurved, arcuate, linear, flat, 5-10 cm נ1.2-2 mm, nerveless or faintly nerved to the middle; seeds in 1 row, oblong, narrowly winged; 2n=14. Woods and hillsides; Que. to S.D., s. to Ga. and Okla. Apr.-June. Var. burkii Porter, with nonsagittate cauline lvs, occurs from Pa. and Md. to Va. and W.Va., sometimes on shale-barrens.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Borodinia laevigata image
Paul Rothrock  
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Paul Rothrock  
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Paul Rothrock  
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Paul Rothrock  
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John Hilty  
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Steven J. Baskauf  
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Steven J. Baskauf  
Borodinia laevigata image
Steven J. Baskauf  
Borodinia laevigata image
Steven J. Baskauf  
Borodinia laevigata image
John Hilty  
Borodinia laevigata image
Steven J. Baskauf  
Borodinia laevigata image
Steven J. Baskauf  
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