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

Distribution

V7 554-distribution-map.gif

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

Discussion

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

None.

Lower Taxa

None.

"elongated" is not a number."thick" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Boechera missouriensis"
oblong +  and ovate +
Ihsan A. Al-Shehbaz +  and Michael D. Windham +
(Greene) Al-Shehbaz +
not +  and rosulate +
Arabis missouriensis +
appendaged +  and unappendaged +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
not +  and auriculate +
lyrate-pinnatifid +, dentate +  and entire +
dissected +, repand +, sinuate +, crenate +  and dentate +
oblanceolate +
much smaller +  and reduced +
0.5 cm5 mm <br />0.005 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
not evident +
petiolate +  and sessile +
well-developed +
indistinct +
not +  and differentiated +
emarginate +  and entire +
Ark. +, Conn. +, Ga. +, Ill. +, Ky. +, Mass. +, Mich. +, Minn. +, Mo. +, N.Y. +, N.C. +, Okla. +, S.C. +  and Wis. +
6 cm60 mm <br />0.06 m <br /> (11 cm110 mm <br />0.11 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
50-300 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
actinomorphic +
ascending +  and divaricate-ascending +
torulose +, falcate +, lanceolate +, oblong +  and linear +
Rocky bluffs, wooded slopes, valley bottoms +
annular +  and semiannular +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
ciliate-mucronate +
prominent +  and obscure +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
5mm;10mm +
rudimentary +
oblanceolate +  and spatulate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Flowering Mar–Jun. +
trinucleate +  and 3(-11)-colpate +
ellipsoid +
branched;18-47-flowered +
curved +  and straight +
suberect +  and divaricate-ascending +
slender +
0.5 cm5 mm <br />0.005 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
mucilaginous +
margined +, not winged +  and winged +
biseriate +, sub-biseriate +  and uniseriate +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
orbicular +, oblong +  and flattened +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
oblong +  and ovate +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
tetradynamous +
branched +  and unbranched +
procumbent +  and decumbent +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
glabrous +  and pubescent +
Arabis laevigata var. heterophylla +, Arabis laevigata var. missouriensis +, Arabis missouriensis var. deamii +, Arabis viridis +  and Arabis viridis var. deamii +
Boechera missouriensis +
Boechera +
species +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
coiled +, 1-7-veined +  and veined +
anastomosing +
biennial +  and short-lived +
hispid +, hirsute +, pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +
0.1mm;0.4mm +