Allium rhizomatum |
Allium drummondii |
|
---|---|---|
spreading wild onion |
Drummond onion, Drummond's onion |
|
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. |
1–5, without basal bulbels, ovoid, 1–1.8 × 0.7–1.5 cm; outer coats enclosing 1 or more bulbs, brown, reticulate, cells fine-meshed, mostly closed in proximal 1/2 of bulb, fibrous; inner coats whitish or brownish, cells intricately contorted, walls usually not sinuous. |
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. |
persistent, green at anthesis, 2–5, sheathing; blade solid, flat, channeled, 10–30 cm × 1–3(–5) mm, margins entire. |
Scape | solitary, erect, solid, terete, 20–30 cm × 1–3 mm. |
persistent, solitary, erect, terete, 10–30 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 lance-ovate, ± equal, apex acute. |
persistent, erect, compact to ± loose, usually 10–25-flowered, hemispheric-globose, rarely replaced by bulbils; spathe bracts persistent, 2–3, 1-veined, ovate, ± equal, apex acuminate. |
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. |
campanulate to ± stellate, 6–9 mm; tepals spreading, white, pink, or red, rarely greenish yellow, ovate to lanceolate, ± equal, becoming papery and rigid in fruit, margins entire, apex obtuse or acute, midribs somewhat thickened; stamens included; anthers yellow; pollen light yellow; ovary crestless; style linear, equaling stamens; stigma capitate, unlobed or obscurely lobed; pedicel 5–20 mm. |
Seed | coat shining; cells smooth. |
coat shining; cells each usually with minute, central papilla. |
2n | = 28. |
= 14, 28. |
Allium rhizomatum |
Allium drummondii |
|
Phenology | Flowering Jul–Sep. | Flowering Mar–Jun. |
Habitat | Dry, usually grassy areas | Plains, hills, and prairies, particularly in limestone soils |
Elevation | 1200–2200 m (3900–7200 ft) | 0–1600 m (0–5200 ft) |
Distribution |
AZ; NM; TX; Mexico
|
AR; KS; NE; NM; OK; TX; 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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 26. | FNA vol. 26, p. 239. |
Parent taxa | Liliaceae > Allium | Liliaceae > Allium |
Sibling taxa | ||
Synonyms | A. helleri, A. nuttallii, A. reticulatum var. nuttallii | |
Name authority | Wooton & Standley: Contr. U.S. Natl. Herb. 16: 114. (1913) | Regel: Trudy Imp. S.-Peterburgsk. Bot. Sada 3: 112. (1875) |
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