Allium cernuum |
Allium schoenoprasum |
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lady's leek, nodding onion |
chive, wild chives |
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Bulbs | 2–5+, clustered, often short-rhizomatous at base, rhizome not stout or iris-like, oblong, elongate, 1–3 × 0.8–1.5 cm; outer coats enclosing 1 or more bulbs, grayish or brownish, membranous, minutely striate, cells in regular vertical rows, narrowly elongate, fibers persistent, parallel, few; inner coats white to pink or reddish, cells in regular vertical rows, narrowly elongate. |
1 or more, clustered, short-rhizomatous at base, cylindric, elongate, 0.5–0.9 × 1.5–2 cm; outer coats enclosing bulbs, grayish or brownish, persisting as fibrous reticulum but often appearing membranous as outer coats are lost during collecting, cells minutely striate; inner coats whitish or pinkish, cells closely parallel, elongate. |
Leaves | persistent, green at anthesis, 3–5, basally sheathing, sheaths not extending much above soil level; blade solid, flat, channeled to broadly V-shaped in cross section, 10–25 cm × 1–6 mm, margins entire or denticulate. |
persistent, green at anthesis, usually 2, distalmost usually ensheathing 1/3–1/2 scape; blade hollow, terete, fistulose, 20–60 cm × 2–7 mm. |
Scape | persistent, sometimes 2 or more produced successively from single bulb, usually clustered, nodding, solid, terete or ridged, particularly distally, sometimes flattened and narrowly winged, abruptly recurved near apex, 10–50 cm × 1–3 mm. |
persistent, 2–12+, clustered, erect, terete, fistulose, 20–50 cm × 3–5 mm. |
Umbel | persistent, cernuous, loose, 8–35-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 3-veined, lanceolate, ± equal, apex acuminate, beakless. |
persistent, erect, compact, 30–50-flowered, ± subglobose, bulbils unknown; spathe bracts persistent, 2, 3–7-veined, lanceolate to broadly ovate, ± equal, apex short-acuminate. |
Flowers | campanulate, 4–6 mm; tepals ± erect, pink or white, elliptic-ovate, ± equal, withering in fruit, margins ± entire, apex ± obtuse, at least outer tepals strongly incurved, midribs not thickened; stamens exserted; anthers yellow; pollen yellow; ovary conspicuously crested; processes 6, flattened, ± triangular, margins entire or toothed; style exserted, linear, ± equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 6–25 mm, becoming stouter in fruit, elongating and bending abruptly upward from near point of attachment. |
campanulate, 8–12 mm; tepals erect, pale purple to deep lilac, drying pink, particularly on midrib, or white, elliptic to lanceolate, ± equal, becoming papery in fruit, permanently investing capsule, margins entire, apex acute to acuminate, tips ± recurved, midribs not thickened; stamens included; anthers purple; pollen white; ovary crestless; style linear, equaling stamens; stigma capitate, unlobed or obscurely lobed; pedicel 2–6 mm. |
Seed | coat dull or shining; cells smooth, minutely roughened, or each with minute, central papilla. |
coat shining; cells minutely roughened, not pustuliferous. |
2n | = 14. |
= 16. |
Allium cernuum |
Allium schoenoprasum |
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Phenology | Flowering Jul–Oct. | Flowering Jun–Aug. |
Habitat | Widely distributed on moist soils in mountainous and cool regions | Wet meadows, rocky or gravelly stream banks and lake shores, circumboreal |
Elevation | 600–3500 m (2000–11500 ft) | 0–3500 m (0–11500 ft) |
Distribution |
AL; AR; AZ; CO; DC; GA; IA; ID; IL; IN; KY; MD; MI; MN; MO; MT; NC; NE; NM; NY; OH; OR; PA; SC; SD; TN; TX; UT; VA; WA; WI; WV; WY; AB; BC; ON; SK; Mexico
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AK; CO; CT; ID; MA; ME; MI; MN; MT; NH; NJ; NY; OH; OR; PA; RI; VT; WA; WI; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; Siberia
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Discussion | Allium cernuum is the most widespread North American species of the genus. It is closely related to A. stellatum, and the character commonly used to differentiate them has been umbel orientation. In both species, the inflorescence is nodding in bud, but in A. stellatum it usually becomes erect by anthesis. In A. cernuum the peduncle remains permanently recurved near the apex, although the inflorescence may sometimes become erect overall, or nearly so. While this character is helpful in identification, an almost exclusive reliance on it (even by one of the present authors in his youth) has obscured other clearer distinctions between the species and has confused their geographic ranges. More reliable characters for differentiating these species are bulb shape (elongate in A. cernuum, ovoid in A. stellatum) and perianth shape (campanulate in A. cernuum, stellate in A. stellatum). Unfortunately, perianth shape is often difficult to see in herbarium specimens. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Allium schoenoprasum is native in North America, but it is also cultivated and has widely escaped. It is an extremely polymorphic species, and throughout its range both large and small races occur. These plants have been known as A. sibiricum, A. schoenoprasum var. sibiricum, or A. schoenoprasum var. laurentianum, and many, largely unsuccessful, attempts have been made to distinguish the varieties. Until the variation can be worked out along natural lines, if any, instead of unstable features such as plant size, and color and shape of the tepals, recognition of these varieties is unsound. Because we are unable to separate native populations from many of the escaped ones, we cannot reliably map the native distribution of this taxon in the flora. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26, p. 247. | FNA vol. 26, p. 240. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. allegheniense, A. oxyphilum, A. recurvatum | A. schoenoprasum var. laurentianum, A. schoenoprasum var. sibiricum, A. sibiricum |
Name authority | Roth: Arch. Bot. (Leipzig) 1: 40. (1798) | Linnaeus: Sp. Pl. 1: 301. (1753) |
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