Boechera gracilipes

(Greene) Dorn

Brittonia 55: 3. 2003.

Basionym: Arabis gracilipes Greene Pittonia 4: 193. 1900
Synonyms: Arabis arcuata var. longipes S. Watson Arabis perennans var. longipes (S. Watson) Jepson
Treatment appears in FNA Volume 7. Treatment on page 381. Mentioned on page 350, 358.

Biennials or perennials; short-lived; sexual; caudex present or absent. Stems usually 1 per caudex branch, arising from center of rosette near ground surface, rarely arising laterally proximal to sterile shoots, 2.5–8.5 dm, densely pubescent proximally, trichomes simple or spurred, 0.9–1.5 mm, glabrous distally. Basal leaves: blade oblanceolate, 5–12 mm wide, margins shallowly dentate, sometimes ciliate near petiole base, surfaces sparsely to densely pubescent, trichomes short to long-stalked, 2-rayed or 3-rayed, usually 0.3–0.6 mm. Cauline leaves: 30–65, often concealing stem proximally; blade auricles 0.8–3 mm, surfaces of distalmost leaves usually glabrous. Racemes (12–) 15–50-flowered, usually unbranched. Fruiting pedicels divaricate-ascending or horizontal, recurved, (15–) 20–47 mm, glabrous. Flowers ascending at anthesis; sepals pubescent; petals white to pale lavender, 6–9 × 0.6–1 mm; valves glabrous; pollen ellipsoid. Fruits widely pendent, not appressed to rachis, not secund, curved, edges parallel, (2.5–) 3–7.5 cm × 1.5–2.8 mm, glabrous; ovules 130–210 per ovary; style 0.2–0.5 mm. Seeds biseriate, 1.2–1.4 × 0.7–0.9 mm; wing continuous or distal, to 0.2 mm wide.


Phenology: Flowering Apr–Jun.
Habitat: Basalt, limestone, and sandy soils in ponderosa pine forests and pinyon-juniper woodlands
Elevation: 1700-2300 m

Discussion

Fruiting pedicel length, considered diagnostic by R. C. Rollins (1993) and N. H. Holmgren (2005b), occasionally fails to separate Boechera gracilipes from the closely-related B. fendleri. The two are consistently distinguished by trichome characters. In B. gracilipes, basal leaves usually lack prominent cilia and surfaces are persistently pubescent with at least some 3-rayed trichomes. Also, stems are rather densely pilose proximally, with the largest trichomes more than 0.9 mm. By contrast, basal leaves of B. fendleri always have prominent cilia, surfaces are often glabrescent, and 3-rayed trichomes usually are rare or absent. Stems of the latter are proximally hirsute to hispid, with the largest trichomes less than 0.9 mm.

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 gracilipes"
oblong +  and ovate +
Ihsan A. Al-Shehbaz +  and Michael D. Windham +
(Greene) Dorn +
not +  and rosulate +
Arabis gracilipes +
appendaged +  and unappendaged +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.3 cm3 mm <br />0.003 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 /> (1.2 cm12 mm <br />0.012 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
petiolate +  and sessile +
well-developed +
indistinct +
not +  and differentiated +
emarginate +  and entire +
Ariz. +, Nev. +  and Utah. +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
1700-2300 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
actinomorphic +
torulose +, falcate +, lanceolate +, oblong +  and linear +
Basalt, limestone, and sandy soils in ponderosa pine forests and pinyon-juniper woodlands +
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 +
white +  and pale lavender +
rudimentary +
oblanceolate +  and spatulate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering Apr–Jun. +
trinucleate +  and 3(-11)-colpate +
ellipsoid +
unbranched;(12-)15-50-flowered +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
recurved +, horizontal +  and divaricate-ascending +
slender +
2 cm20 mm <br />0.02 m <br /> (4.7 cm47 mm <br />0.047 m <br />) +
mucilaginous +
margined +, not winged +  and winged +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
orbicular +, oblong +  and flattened +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 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 +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
glabrous +  and pubescent +
Arabis arcuata var. longipes +  and Arabis perennans var. longipes +
Boechera gracilipes +
Boechera +
species +
long-stalked +, spurred +  and simple +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
coiled +, 1-7-veined +  and veined +
anastomosing +
perennial +, short-lived +  and biennial +
hispid +, hirsute +, pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +
0mm;0.2mm +