Boechera hoffmannii

(Munz) Al-Shehbaz

Novon 13: 386. 2003.

Basionym: Arabis maxima var. hoffmannii Munz Bull. S. Calif. Acad. Sci. 31: 63. 1932
Synonyms: Arabis hoffmannii (Munz) Rollins
Treatment appears in FNA Volume 7. Treatment on page 383. Mentioned on page 356, 362, 384.

Perennials; long-lived; sexual; caudex woody (sometimes with persistent, crowded leaf-bases). Stems usually 1 per caudex branch, arising from center of rosette, often elevated above ground surface on woody base, 5–7 dm, glabrous or sparsely pubescent proximally, trichomes short-stalked, 2-rayed or 3-rayed, 0.15–0.4 mm, glabrous or sparsely pubescent distally. Basal leaves: blade narrowly oblanceolate, 3–8 mm wide, margins coarsely dentate, ciliate, trichomes (simple and 2-rayed), to 0.6 mm, surfaces sparsely to densely pubescent, trichomes short-stalked, 2–7-rayed, 0.15–0.4 mm. Cauline leaves: 15–65, concealing stem; blade auricles 1–4 mm, surfaces of distalmost leaves pubescent. Racemes 30–70-flowered, sometimes branched. Fruiting pedicels divaricate-ascending, straight, 10–45 mm, glabrous. Flowers ascending at anthesis; sepals pubescent; petals white or pale lavender, 8–10 × 1.5–2 mm, glabrous; pollen ellipsoid. Fruits divaricate-ascending to horizontal, not appressed to rachis, not secund, usually curved, rarely straight, edges parallel, 6–10 cm × 2.5–3 mm; valves glabrous; ovules 170–220 per ovary; style 0.05–0.5 mm. Seeds biseriate, 1.2–1.6 × 0.9–1.2 mm; wing continuous, 0.1–0.2 mm wide.


Phenology: Flowering Feb–Mar.
Habitat: Sea cliff ledges and crevices of volcanic outcrop in chaparral communities
Elevation: 0-100 m

Discussion

Of conservation concern.

Boechera hoffmannii is a distinctive sexual species that appears to be restricted to Santa Cruz Island in Santa Barbara County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

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 hoffmannii"
oblong +  and ovate +
Ihsan A. Al-Shehbaz +  and Michael D. Windham +
(Munz) Al-Shehbaz +
not +  and rosulate +
Arabis maxima var. hoffmannii +
appendaged +  and unappendaged +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
not +  and auriculate +
lyrate-pinnatifid +, dentate +  and entire +
dissected +, repand +, sinuate +, crenate +  and dentate +
oblanceolate +
much smaller +  and reduced +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
petiolate +  and sessile +
well-developed +
indistinct +
not +  and differentiated +
emarginate +  and entire +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0-100 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
actinomorphic +
straight +  and curved +
divaricate-ascending +  and horizontal +
torulose +, falcate +, lanceolate +, oblong +  and linear +
Sea cliff ledges and crevices of volcanic outcrop in chaparral communities +
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 +
pale lavender +  and white +
8mm;10mm +
rudimentary +
oblanceolate +  and spatulate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering Feb–Mar. +
trinucleate +  and 3(-11)-colpate +
ellipsoid +
branched;30-70-flowered +
divaricate-ascending +
slender +
1 cm10 mm <br />0.01 m <br /> (4.5 cm45 mm <br />0.045 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 /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
orbicular +, oblong +  and flattened +
0.09 cm0.9 mm <br />9.0e-4 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 +
pubescent +  and glabrous +
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 />) +
Arabis hoffmannii +
Boechera hoffmannii +
Boechera +
species +
pubescent +  and glabrous +
0.015 cm0.15 mm <br />1.5e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-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 +
0.1mm;0.2mm +