Boechera missouriensis

(Greene) Al-Shehbaz

Novon 13: 387. 2003.

Basionym: Arabis missouriensis Greene Repert. Spec. Nov. Regni Veg. 5: 244. 1908
Synonyms: Arabis laevigata var. heterophylla (Nuttall) Farwell Arabis laevigata var. missouriensis (Greene) H. E. Ahles Arabis missouriensis var. deamii (M. Hopkins) M. Hopkins Arabis viridis Arabis viridis var. deamii M. Hopkins
Treatment appears in FNA Volume 7. Treatment on page 390. Mentioned on page 355, 362, 387, 391.

Biennials; short-lived; sexual; caudex not evident. Stems usually 1 per plant, arising from center of rosette near ground surface, 2–7.5 dm, sparsely pubescent proximally, trichomes simple, to 0.5 mm, or glabrous throughout. Basal leaves: blade oblanceolate, 5–18 mm wide, margins lyrate-pinnatifid, often ciliate-mucronate on lobes, trichomes minute, surfaces glabrous or sparsely pubescent, trichomes simple, 0.1–0.5 mm. Cauline leaves: 10–45, often concealing stem proximally; blade auricles 1–5 mm, surfaces glabrous. Racemes 18–47-flowered, sometimes branched. Fruiting pedicels suberect to divaricate-ascending, straight or slightly curved, 5–13 mm, glabrous. Flowers ascending at anthesis; sepals glabrous; petals white, 5–10 × 1–1.5 mm, glabrous; pollen ellipsoid. Fruits ascending to divaricate-ascending, not appressed to rachis, not secund, curved, edges parallel, 6–11 cm × 1.5–2 mm; valves glabrous; ovules 60–86 per ovary; style 0.1–1 mm. Seeds uniseriate, 1.2–2 × 1–1.2 mm; wing continuous, 0.1–0.4 mm wide.

Phenology: Flowering Mar–Jun.
Habitat: Rocky bluffs, wooded slopes, valley bottoms
Elevation: 50-300 m


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Ark., Conn., Ga., Ill., Ky., Mass., Mich., Minn., Mo., N.Y., N.C., Okla., S.C., Wis.


Boechera missouriensis occasionally has been treated as a variety of B. laevigata. With its significantly longer petals (5–10 versus 3–5 mm) and distinctive, lyrate-pinnatifid basal leaves that persist well beyond anthesis, it warrants recognition as a species.

Selected References


Lower Taxa

... more about "Boechera missouriensis"
Ihsan A. Al-Shehbaz +  and Michael D. Windham +
(Greene) Al-Shehbaz +
Arabis missouriensis +
Ark. +, Conn. +, Ga. +, Ill. +, Ky. +, Mass. +, Mich. +, Minn. +, Mo. +, N.Y. +, N.C. +, Okla. +, S.C. +  and Wis. +
50-300 m +
Rocky bluffs, wooded slopes, valley bottoms +
Flowering Mar–Jun. +
Arabis laevigata var. heterophylla +, Arabis laevigata var. missouriensis +, Arabis missouriensis var. deamii +, Arabis viridis +  and Arabis viridis var. deamii +
Boechera missouriensis +
Boechera +
species +