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glandular dwarf-flax, glandular western flax

Lake County dwarf-flax, Lake County western flax

Habit Herbs, (10–)15–25(–50) cm, glabrous except puberulent on stems just distal to nodes; branches from well-developed main axis, alternate, widely spreading. Herbs, 10–30 cm, glabrous except microscopically puberulent on stems distal to nodes; branches from short main axis, alternate, spreading.
Leaves

opposite or proximal whorled;

stipular glands absent;

blade linear to lanceolate, 5–15(–20) × 1.5–2.5 mm, base keeled, clasping, margins with stalked glands on teeth in 1–2 rows.

alternate;

stipular glands present on proximal nodes;

blade threadlike to linear, 10–20(–30) × 1–1.5 mm, base flat, not clasping, margins eglandular.

Inflorescences

cymes monochasial to dichasial (scorpioid or helicoid), open, internodes long, flowers widely scattered along thin branchlets;

bract margins with stalked glands.

cymes dichasial, open, internodes long, flowers widely scattered;

bract margins eglandular.

Pedicels

(3–)5–10(–15) mm, to 25 mm in fruit, spreading at 45–90° angle, not bent at apex.

(2–)5–8(–15) mm, 20+ mm in fruit, spreading at 45–90° angle, not reflexed or bent at apex.

Flowers

sepals erect, tips spreading, lanceolate, 2–3 mm, subequal, marginal glands few or absent, surfaces glabrous;

petals horizontally spreading, yellow, often veined or tinged orange, fading white, oblanceolate, 3–4(–5) mm, apex notched;

cup yellow, rim lobed between filaments and petal attachments;

stamens exserted;

filaments 2.5–3.5(–4) mm;

anthers yellow, dehisced anthers 1.2–1.5 mm;

ovary chambers 6;

styles 3, yellow, 2.5–3(–4) mm, exserted.

sepals spreading, lanceolate, 2–3 mm, ± equal, marginal glands minute or absent, surfaces glabrous;

petals horizontally spreading, white or light pink or pink to deep purplish pink and streaked with light or deeper pink, veins white, oblanceolate to obovate or nearly oval, 2.5–3(–4) mm, apex notched;

cup white, rim lobed between petal attachment and filaments;

stamens exserted;

filaments 2.5–3 mm;

anthers white to deep purplish pink bordered with white, dehisced anthers 1.2–2 mm;

ovary chambers 4;

styles 2, white, 2.5–4 mm, exserted.

2n

= 36.

Hesperolinon adenophyllum

Hesperolinon didymocarpum

Phenology Flowering May–Aug. Flowering May–Jun.
Habitat Chaparral and brushy slopes on serpentine soils. Chaparral, grasslands, under scattered Pinus sabiniana, serpentine soils.
Elevation 150–1000 m. (500–3300 ft.) 100–200 m. (300–700 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

Hesperolinon adenophyllum is found in the north and central North Coast Ranges, especially in Lake and Mendocino counties. It can be distinguished from all other species in the genus except H. drymarioides in having glandular-serrate leaves. The leaves of H. adenophyllum are lanceolate with large glands in one or two rows on the margin, compared with H. drymarioides, which has ovate to orbiculate leaves with several rows of relatively small, delicate glands on the margins.

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

Hesperolinon didymocarpum is known only from fewer than ten populations in the Inner North Coast Ranges in Big Canyon Creek, Lake County.

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

Source FNA vol. 12, p. 400. FNA vol. 12, p. 400.
Parent taxa Linaceae > Hesperolinon Linaceae > Hesperolinon
Sibling taxa
H. bicarpellatum, H. breweri, H. californicum, H. clevelandii, H. congestum, H. didymocarpum, H. disjunctum, H. drymarioides, H. micranthum, H. sharsmithiae, H. spergulinum, H. tehamense
H. adenophyllum, H. bicarpellatum, H. breweri, H. californicum, H. clevelandii, H. congestum, H. disjunctum, H. drymarioides, H. micranthum, H. sharsmithiae, H. spergulinum, H. tehamense
Synonyms Linum adenophyllum
Name authority (A. Gray) Small: in N. L. Britton et al., N. Amer. Fl. 25: 85. (1907) H. Sharsmith: Univ. Calif. Publ. Bot. 32: 302, figs. 11h, 15a, 17a, 18b, 20. (1961)
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