Boechera depauperata

(A. Nelson & P. B. Kennedy) Windham & Al-Shehbaz

Harvard Pap. Bot. 11: 262. 2007.

Basionym: Arabis depauperata A. Nelson & P. B. Kennedy Proc. Biol. Soc. Wash. 19: 36. 1906
Synonyms: Arabis lemmonii var. depauperata (A. Nelson & P. B. Kennedy) Rollins
Treatment appears in FNA Volume 7. Treatment on page 373. Mentioned on page 361.

Perennials; usually long-lived; (cespitose); apomictic; caudex woody. Stems usually 1 per caudex branch, arising from center of rosette near ground surface, 0.5–1.5 (–2) dm, densely pubescent proximally, trichomes short-stalked, 4–8-rayed, 0.07–0.4 mm, usually sparsely pubescent distally, rarely glabrous. Basal leaves: blade narrowly oblanceolate, 0.7–3 (–5) mm wide, margins entire, sometimes ciliate proximally, trichomes to 0.4 mm, surfaces densely pubescent, trichomes short-stalked, 5–8-rayed, 0.05–0.25 mm. Cauline leaves: 3–7, not concealing stem; blade auricles 0.5–1.5 mm, surfaces of distalmost leaves usually pubescent, rarely glabrous. Racemes 9–23-flowered, unbranched. Fruiting pedicels divaricate-ascending, straight, 1.5–7 mm, usually pubescent, rarely glabrous, trichomes appressed, branched. Flowers ascending at anthesis; sepals pubescent; petals lavender to purplish, 3.5–5 × 0.8–1.2 mm, glabrous; pollen spheroid. Fruits divaricate-ascending, not appressed to rachis, not secund, straight, edges parallel, 1.7–3.5 (–4.5) cm × 1–1.5 mm; valves glabrous; ovules 32–44 per ovary; style 0.05–0.2 mm. Seeds uniseriate, 1.2–1.5 × 1–1.2 mm; wing continuous, 0.1–0.15 mm wide.


Phenology: Flowering Jun–Jul.
Habitat: Exposed ridges and talus slopes in subalpine and alpine habitats
Elevation: 2700-3900 m

Discussion

Morphological evidence suggests that Boechera depauperata is an apomictic species that arose through hybridization between B. lemmonii and B. paupercula (see M. D. Windham and I. A. Al-Shehbaz 2007 for detailed comparison). It is known in California from Fresno, Mono, and Tulare counties and in Nevada from Washoe County.

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 depauperata"
oblong +  and ovate +
Ihsan A. Al-Shehbaz +  and Michael D. Windham +
(A. Nelson & P. B. Kennedy) Windham & Al-Shehbaz +
not +  and rosulate +
Arabis depauperata +
appendaged +  and unappendaged +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
lyrate-pinnatifid +, dentate +  and entire +
dissected +, repand +, sinuate +, crenate +  and dentate +
oblanceolate +
much smaller +  and reduced +
0.7mm;3mm +
urceolate +, campanulate +  and tubular +
branched +  and simple +
petiolate +  and sessile +
well-developed +
indistinct +
not +  and differentiated +
emarginate +  and entire +
Calif. +  and Nev. +
3.5 cm35 mm <br />0.035 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
1.7 cm17 mm <br />0.017 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
2700-3900 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
actinomorphic +
straight +
divaricate-ascending +
torulose +, falcate +, lanceolate +, oblong +  and linear +
Exposed ridges and talus slopes in subalpine and alpine 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 +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
rudimentary +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Flowering Jun–Jul. +
trinucleate +  and 3(-11)-colpate +
spheroid +
Harvard Pap. Bot. +
unbranched;9-23-flowered +
elongated +
reflexed +, ascending +  and erect +
slender +
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 /> (0.15 cm1.5 mm <br />0.0015 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 +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
glabrous +  and pubescent +
Arabis lemmonii var. depauperata +
Boechera depauperata +
Boechera +
species +
branched +  and short-stalked +
glabrous +  and pubescent +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.025 cm0.25 mm <br />2.5e-4 m <br />) +
coiled +, 1-7-veined +  and veined +
anastomosing +
perennial +  and long-lived +
divaricate-ascending +
glabrous +  and pubescent +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +
0.1mm;0.15mm +