Allium robinsonii

L. F. Henderson

Rhodora 32: 22. 1930.

Endemic
Treatment appears in FNA Volume 26. Treatment on page 276. Mentioned on page 233.

Bulbs 1–3+, not clustered on stout primary rhizome, rhizomes absent, renewal bulbs formed within coats of parent bulb, increase bulbs absent or 1–2, ± equaling parent bulbs, never appearing as basal cluster, ovoid, 1–2 cm × 8–15 mm; outer coats grayish to brownish, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats white, cells absent or ± quadrate. Leaves usually deciduous with scape, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, strongly falcate, 5–18 cm × 1–2 mm, margins entire. Scape usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, erect, solid, flattened, slightly 2-edged, 3–7 cm × 1–3 mm. Umbel deciduous with scape, erect, compact, 5–12-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 5–8-veined, ovate, ± equal, apex abruptly acute. Flowers campanulate, 7–9 mm; tepals erect, white to pale-pink with red midribs, oblong, ± equal, becoming papery and not carinate in fruit, margins entire, apex obtuse; stamens included; anthers purple; pollen gray or yellow; ovary ± distinctly crested; processes 3 or 6, central, low, rounded, margins entire; style included, linear; stigma capitate, unlobed; pedicel 3–12 mm. Seed-coat dull; cells smooth. 2n = 14.


Phenology: Flowering Apr–May.
Habitat: Sand and gravel deposits along bottom and lower benches of Columbia River
Elevation: 50–200 m

Discussion

Allium robinsonii has been found along the Columbia River from Ferry County, northeastern Washington, to about the mouth of the John Day River, north-central Oregon, and is now possibly extirpated from Oregon.

Selected References

None.

Lower Taxa

None.

"thicker" is not a number."broad" is not a number.

... more about "Allium robinsonii"
versatile +  and dorsifixed +
cordate +  and linear +
Obtuse (?) +  and Acute (?) +
Dale W. McNeal Jr. +  and T. D. Jacobsen +
L. F. Henderson +
whorled +, opposite +  and alternate +
dilated +
straight +
5 cm50 mm <br />0.05 m <br /> (18 cm180 mm <br />0.18 m <br />) +
falcate +
1mm;2mm +
conspicuous +
1 +  and 3 +
roughened +  and smooth +
quadrate +
Oreg. +  and Wash. +
50–200 m +
connate-coroniform +  and dilated +
sessile +  and pedicellate +
unisexual +  and bisexual +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
loculicidal +
membranaceous +  and leathery +
Sand and gravel deposits along bottom and lower benches of Columbia River +
paired +, paniculate +  and racemose +
deciduous +
grayish +  and brownish +
crested +
many;several +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
spreading +  and erect +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
membranous +
zygomorphic +  and actinomorphic +
Flowering Apr–May. +
yellow +  and gray +
low +  and central +
6 (?) +  and 3 (?) +
2 (?) +  and 3 (?) +
2-edged +  and solid +
deciduous +
3cm +  and 7cm +
flattened +
1mm +  and 3mm +
wind-distributed +
1 +  and many +
obovoid +
adnate +  and free +
1 +  and several +
Allium robinsonii +
species +
white;pale-pink +
persisting +
distinct +
not carinate +  and oblong +
sepaloid +  and petaloid +
narrower +
5-12-flowered +
deciduous +
9 +, 8 +  and 7 +