Arabis olympica

Piper

Contr. U.S. Natl. Herb. 16: 208. 1913.

Endemic
Synonyms: Arabis furcata var. olympica (Piper) Rollins
Treatment appears in FNA Volume 7. Treatment on page 263. Mentioned on page 258.

Perennials; (caudex branched, covered with persistent petiolar remains); moderately pubescent, trichomes simple or short-stalked, forked, (to 0.6 mm). Stems simple or few from base (caudex), erect, unbranched, 0.7–1.1 dm, (pubescent throughout, trichomes short-stalked, forked). Basal leaves: petiole 0.3–0.6 cm, (sparsely ciliate); blades oblanceolate to obovate, 0.4–1cm × 2–7 mm, margins entire or repand, (ciliate), apex obtuse, surfaces sparsely pubescent, trichomes simple and forked. Cauline leaves 4–6; blade oblong, 0.6–0.8 cm × 2–3 mm, base not auriculate, margins entire, (ciliate), apex obtuse. Racemes simple, (dense). Fruiting pedicels erect, (subappressed to rachis), 5–6.5 mm, (glabrous). Flowers: sepals (greenish), ovate, 1.5 × 0.5 mm, lateral pair not saccate basally, (glabrous); petals white, oblanceolate, 3.5–4 × 1 mm, apex rounded. Fruits erect, (appressed to rachis), slightly torulose, 2–2.3 cm × 1 mm; valves each with distinct midvein extending full length; ovules 28–34 per ovary; style 0.2–0.3 mm, (stout). Seeds winged distally, oblong, ca. 1 × 0.5 mm; wing ca. 0.1 mm wide.


Phenology: Flowering Aug.
Habitat: Talus slopes near glacier
Elevation: ca. 1400 m

Discussion

Arabis olympica, which is known from two collections, J. B. Flett s.n. (holotype, US; isotype, WS) and N. Buckingham 1577 (WS) that were made from Jefferson and Clallam counties, respectively, was reduced by R. C. Rollins (1936, 1941, 1993) to a variety of A. furcata. An examination of the type collections of both species reveals that they are distinct. Although the fruits and seeds of A. olympica are not fully mature, they are clearly different in width and orientation from those of A. furcata at the same developmental stage. The striking differences in fruit width and orientation, stem indument, and seed and flower size support their maintenance as distinct species. Although both species grow in Washington, the range of A. olympica seems to be restricted to Clallam and Jefferson counties and is disjunct from Chelan, Kittitas, and Yakima counties, where A. furcata grows.

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 "Arabis olympica"
linear +, oblong +  and ovate +
rounded +  and obtuse +
Ihsan A. Al-Shehbaz +
sessile +  and petiolate +
not auriculate +
appendaged +  and unappendaged +
not +  and auriculate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
lyrate-pinnatifid +, dentate to denticulate +  and entire +
dissected +, repand +, sinuate +, crenate +  and dentate +
oblong;oblanceolate;obovate +
much smaller +  and reduced +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
petiolate +  and sessile +
well-developed +
distinct +
differentiated +
emarginate +  and entire +
ca. 1400 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
actinomorphic +
1.5 cm15 mm <br />0.015 m <br /> (?) +
0.5 cm5 mm <br />0.005 m <br /> (?) +
latiseptate +  and unsegmented +
indehiscent +  and dehiscent +
2 cm20 mm <br />0.02 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
torulose +
1 cm10 mm <br />0.01 m <br /> (?) +
latiseptate +, stipitate +  and sessile +
flattened +  and torulose +
Talus slopes near glacier +
annular +  and semiannular +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
repand;entire +
prominent +  and obscure +
forked +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
3.5mm;4mm +
rudimentary +
oblanceolate +
1 cm10 mm <br />0.01 m <br /> (?) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Flowering Aug. +
trinucleate +  and 3(-11)-colpate +
Contr. U.S. Natl. Herb. +
slender +
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
mucilaginous +
uniseriate +  and biseriate +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
1 cm10 mm <br />0.01 m <br /> (?) +
0.5 cm5 mm <br />0.005 m <br /> (?) +
not basally +  and saccate +
persistent +  and caducous +
distinct +
ascending +  and erect +
oblong +  and ovate +
reduced +
latiseptate +  and unsegmented +
indehiscent +  and dehiscent +
latiseptate +  and unsegmented +
indehiscent +  and dehiscent +
tetradynamous +
unbranched +  and simple +
procumbent +  and decumbent +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Arabis furcata var. olympica +
Arabis olympica +
species +
simple +  and short-stalked +
coiled +, 1-7-veined +  and veined +
anastomosing +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +