Allium rhizomatum

Wooton & Standley

Contr. U.S. Natl. Herb. 16: 114. 1913.

Treatment appears in FNA Volume 26. Mentioned on page 230, 258.

Bulbs solitary, not basally clustered, replaced annually by new bulbs borne terminally on rhizome; rhizomes 1–3, conspicuous, slender, 2–3 cm, scaly; parent bulbs persisting, often not collected, oblique-ovoid, 1–2.5 × 1 cm; outer coats enclosing parent bulbs, grayish, lacking cellular reticulation, membranous, without fibers; inner coats white or hyaline, cells obscure, ± quadrate. Leaves persistent, green at anthesis, 2–3, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, not falcate, 20–35 cm × 2–3 mm, margins entire. Scape solitary, erect, solid, terete, 20–30 cm × 1–3 mm. Umbel persistent, erect, loose, 5–15 (–22) -flowered, globose to hemispheric, bulbils unknown; spathe bracts persistent, 2, 3-veined, ovate to lanceovate, ± equal, apex acute. Flowers stellate, 6–9 mm; tepals erect, pink with purplish or pinkish midveins, oblong to lanceolate, slightly carinate basally, ± equal, becoming papery in fruit, margins entire, apex acute to acuminate; stamens included; anthers yellow or pink; pollen yellow or white; ovary crestless, 3-grooved with thickened ridge on either side of groove; style linear, shorter than stamens; stigma capitate, scarcely thickened, unlobed; pedicel 10–20 (–50) mm. Seed-coat shining; cells smooth. 2n = 28.


Phenology: Flowering Jul–Sep.
Habitat: Dry, usually grassy areas
Elevation: 1200–2200 m

Distribution

V26 474-distribution-map.jpg

Ariz., N.Mex., Tex., Mexico

Discussion

Allium rhizomatum has often been included within the Mexican species A. glandulosum. This reduction is unwarranted. The perianth of A. rhizomatum is pale, with the color mainly confined to the midribs. Additionally, the species can be distinguished by its 3-lobed, apically 3-grooved ovary and lack of sepal glands. Allium glandulosum has a red perianth, an apically rounded ovary, and sepal glands. The nectar produced from these glands does not show in herbarium specimens.

Selected References

None.

Lower Taxa

None.

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

... more about "Allium rhizomatum"
pink +  and yellow +
versatile +  and dorsifixed +
cordate +  and linear +
acute +  and acuminate +
Dale W. McNeal Jr. +  and T. D. Jacobsen +
Wooton & Standley +
whorled +, opposite +  and alternate +
dilated +
straight +
20 cm200 mm <br />0.2 m <br /> (35 cm350 mm <br />0.35 m <br />) +
not falcate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
conspicuous +
1;several +
roughened +  and smooth +
quadrate +
Ariz. +, N.Mex. +, Tex. +  and Mexico +
1200–2200 m +
connate-coroniform +  and dilated +
sessile +  and pedicellate +
unisexual +  and bisexual +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
loculicidal +
membranaceous +  and leathery +
Dry, usually grassy areas +
paired +, paniculate +  and racemose +
hyaline +  and white +
persistent +
pinkish +  and purplish +
3-grooved +  and crestless +
crested;3-lobed +
many;several +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
oblique-ovoid +
1 cm10 mm <br />0.01 m <br /> (?) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
spreading +  and erect +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
membranous +
zygomorphic +  and actinomorphic +
Flowering Jul–Sep. +
white +  and yellow +
Contr. U.S. Natl. Herb. +
1 (?) +  and 3 (?) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
persistent +
20cm +  and 30cm +
1mm +  and 3mm +
wind-distributed +
1 +  and many +
obovoid +
adnate +  and free +
1 +  and several +
Allium rhizomatum +
species +
persisting +
distinct +
carinate +, oblong +  and lanceolate +
sepaloid +  and petaloid +
narrower +
5-15(-22)-flowered +
persistent +
globose;hemispheric +
9 +, 8 +  and 7 +