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Photo is of parent taxon

pitted onion

pitted onion

Bulbs

1–3(–5), not clustered on stout primary rhizome, ovoid, 1–2 × 1–2 cm;

outer coats enclosing 1 or more bulbs, brown, prominently cellular-reticulate, membranous, accumulating and investing bulb with thick cover, cells square, polygonal, or ± transversely elongate, walls thick, sinuous, without fibers;

inner coats white to light brown, cells ± obscure, quadrate.

Leaves

blade subterete to ± terete, arcuate, 1–2 times scape, 1–2 mm wide.

persistent, withering from tip at anthesis, 2–3, basally sheathing, sheaths not extending much above soil surface;

blade solid, flattened, subterete or ± channeled and carinate, ± falcate, 10–30 cm × 0.5–3 mm, margins entire.

Scape

10–20 cm.

persistent, solitary, erect, solid, terete, 10–35 cm × 1–4 mm.

Umbel

compact, 5–25-flowered;

spathe bracts 2, apex acuminate.

persistent, erect, compact or loose, 5–45-flowered, bulbils unknown, umbel shattering after seeds mature, each flower deciduous with its pedicel;

spathe bracts persistent, 2–3, 4–6-veined, lance-ovate to ovate, ± equal, apex obtuse or acuminate.

Flowers

(6–)7–9 mm;

tepals white with deep pink or purple midveins;

pedicel 5–15 mm.

campanulate, 4–9 mm;

tepals erect or spreading from base, white to deep pink with darker midveins, lance-ovate to ovate, ± equal, margins entire, apex obtuse, acute, or short-acuminate;

stamens included;

anthers yellow;

pollen yellow;

ovary 3-grooved with ridge on either side of each groove, ridges prolonged into crest, ridges and crest densely covered with minute, rounded papillae;

processes 3, central, 2-lobed, minute;

style linear, equaling stamens;

stigma capitate, scarcely thickened, obscurely 3-lobed;

pedicel 4–30 mm.

Seed

coat dull or shining;

cells minutely roughened.

2n

= 14.

Allium lacunosum var. lacunosum

Allium lacunosum

Phenology Flowering Apr–Jun.
Habitat Apparently restricted to serpentine clays on ridges and peaks
Elevation 300–1000 m (1000–3300 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Allium lacunosum var. lacunosum is known only from the central and south Coast Ranges, and on Santa Rosa and Santa Cruz islands.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Varieties 4 (4 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Umbel compact; pedicel 0.75–1.5 times flower; scape 10–25 cm.
→ 2
1. Umbel loose; pedicel equaling–3.5 times flower; scape 15–35 cm.
→ 3
2. Scape 10–20 cm; leaf blade 1–2 times scape; flowers (6–)7–9 mm; Coast Ranges of c California and Channel Islands.
var. lacunosum
2. Scape 15–25 cm; leaf blade equaling or shorter than scape; flowers 6–7(–8) mm; Sierra Nevada, California.
var. kernensis
3. Leaf blade subterete, 1 mm or less wide, straight; spathe bracts 3, apex obtuse or acute; flowers 4–6 mm.
var. micranthum
3. Leaf blade ± carinate, to 3 mm wide, ± falcate; spathe bracts 2, apex acuminate; flowers 6–8 mm.
var. davisiae
Source FNA vol. 26, p. 260. FNA vol. 26, p. 260.
Parent taxa Liliaceae > Allium > Allium lacunosum Liliaceae > Allium
Sibling taxa
A. lacunosum var. davisiae, A. lacunosum var. kernensis, A. lacunosum var. micranthum
A. aaseae, A. abramsii, A. acuminatum, A. ampeloprasum, A. amplectens, A. anceps, A. atrorubens, A. bigelovii, A. bisceptrum, A. bolanderi, A. brandegeei, A. brevistylum, A. burlewii, A. campanulatum, A. canadense, A. cepa, A. cernuum, A. columbianum, A. constrictum, A. coryi, A. cratericola, A. crenulatum, A. crispum, A. cuthbertii, A. denticulatum, A. diabolense, A. dichlamydeum, A. dictuon, A. douglasii, A. drummondii, A. elmendorfii, A. falcifolium, A. fibrillum, A. fimbriatum, A. fistulosum, A. geyeri, A. gooddingii, A. haematochiton, A. hickmanii, A. hoffmanii, A. howellii, A. hyalinum, A. jepsonii, A. kunthii, A. lemmonii, A. macropetalum, A. macrum, A. madidum, A. membranaceum, A. monticola, A. munzii, A. neapolitanum, A. nevadense, A. nevii, A. nigrum, A. obtusum, A. oleraceum, A. paniculatum, A. parishii, A. parryi, A. parvum, A. passeyi, A. peninsulare, A. perdulce, A. platycaule, A. plummerae, A. praecox, A. punctum, A. rhizomatum, A. robinsonii, A. rotundum, A. runyonii, A. sanbornii, A. sativum, A. schoenoprasum, A. scilloides, A. serra, A. sharsmithiae, A. shevockii, A. simillimum, A. siskiyouense, A. speculae, A. stellatum, A. textile, A. tolmiei, A. tribracteatum, A. tricoccum, A. triquetrum, A. tuberosum, A. tuolumnense, A. unifolium, A. validum, A. victorialis, A. vineale, A. yosemitense
Subordinate taxa
A. lacunosum var. davisiae, A. lacunosum var. kernensis, A. lacunosum var. lacunosum, A. lacunosum var. micranthum
Name authority unknown S. Watson: Proc. Amer. Acad. Arts 14: 231. (1879)
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