Boechera drepanoloba

(Greene) Windham & Al-Shehbaz

Harvard Pap. Bot. 11: 263. 2007.

Basionym: Arabis drepanoloba Greene Pittonia 3: 306. 1898
Synonyms: Arabis drummondii var. oreophila (Rydberg) M. Hopkins Arabis lemmonii var. drepanoloba (Greene) Rollins Arabis oreophila Rydberg
Treatment appears in FNA Volume 7. Treatment on page 374. Mentioned on page 355, 360, 375.

Perennials; short to long-lived; apomictic; caudex usually not woody. Stems usually 1 per caudex branch, arising from center of rosette near ground surface, 1–4 dm, glabrous or sparsely pubescent proximally, trichomes sessile or subsessile, 2-rayed or 3-rayed, 0.1–0.3 mm, glabrous distally. Basal leaves: blade oblanceolate, 2–6 mm wide, margins entire, ciliate along petiole, trichomes (submalpighiaceous or simple), to 0.6 mm, surfaces sparsely to densely pubescent, trichomes subsessile, 2–6-rayed, 0.1–0.3 mm. Cauline leaves: 3–15, often concealing stem proximally; blade auricles 0.7–2.5 mm, surfaces of distalmost leaves usually glabrous. Racemes 5–25-flowered, usually unbranched. Fruiting pedicels horizontal to ascending, straight or curved, 4–8 mm, glabrous. Flowers ascending at anthesis; sepals glabrous or pubescent with scattered trichomes; petals purple to lavender, 6–8 × 1.5–2.5 mm, glabrous; pollen spheroid. Fruits horizontal to ascending, secund, straight to slightly curved, edges parallel, 3–5.8 cm × 2–3.5 mm; valves glabrous; ovules 44–76 (–104) per ovary; style 0.05–0.5 mm. Seeds uniseriate, 1.5–2.2 × 1.2–1.6 mm; wing continuous, 0.3–0.7 mm wide.


Phenology: Flowering Jul–Aug.
Habitat: Rocky slopes and talus in alpine and subalpine habitats
Elevation: 2000-3800 m

Distribution

V7 516-distribution-map.gif

Alta., Alaska, Colo., Idaho, Mont., Oreg., Utah, Wash., Wyo.

Discussion

Morphological evidence suggests that Boechera drepanoloba is an apomictic species that arose through hybridization between B. lemmonii and B. stricta (see M. D. Windham and I. A. Al-Shehbaz 2007 for detailed comparison).

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 drepanoloba"
oblong +  and ovate +
Ihsan A. Al-Shehbaz +  and Michael D. Windham +
(Greene) Windham & Al-Shehbaz +
not +  and rosulate +
Arabis drepanoloba +
appendaged +  and unappendaged +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
lyrate-pinnatifid +, dentate +  and entire +
dissected +, repand +, sinuate +, crenate +  and dentate +
oblanceolate +
much smaller +  and reduced +
2mm;6mm +
urceolate +, campanulate +  and tubular +
branched +  and simple +
petiolate +  and sessile +
well-developed +
indistinct +
not +  and differentiated +
emarginate +  and entire +
Alta. +, Alaska +, Colo. +, Idaho +, Mont. +, Oreg. +, Utah +, Wash. +  and Wyo. +
3 cm30 mm <br />0.03 m <br /> (5.8 cm58 mm <br />0.058 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
2000-3800 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
actinomorphic +
straight +  and slightly curved +
horizontal +  and ascending +
torulose +, falcate +, lanceolate +, oblong +  and linear +
Rocky slopes and talus in alpine and subalpine habitats +
annular +  and semiannular +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
prominent +  and obscure +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
rudimentary +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Flowering Jul–Aug. +
trinucleate +  and 3(-11)-colpate +
spheroid +
Harvard Pap. Bot. +
unbranched;5-25-flowered +
curved +  and straight +
elongated +
horizontal +  and ascending +
slender +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
mucilaginous +
margined +, not winged +  and winged +
biseriate +, sub-biseriate +  and uniseriate +
not +  and mucilaginous +
White (?) +, Black (?) +, Brown (?) +  and Yellow (?) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
orbicular +, oblong +  and flattened +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
pubescent +  and glabrous +
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 +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
glabrous +  and pubescent +
Arabis drummondii var. oreophila +, Arabis lemmonii var. drepanoloba +  and Arabis oreophila +
Boechera drepanoloba +
Boechera +
species +
subsessile +  and sessile +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
coiled +, 1-7-veined +  and veined +
anastomosing +
perennial +  and long-lived +
hispid +, hirsute +, pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +
0.3mm;0.7mm +