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Marin dwarf-flax, Marin western flax

Habit Herbs, (5–)15–30(–45) cm, glabrous or glabrate; branches from distal nodes, alternate, strongly virgate (proximal unbranched main axis usually long in comparison to branched distal portion).
Leaves

alternate;

stipular glands present;

blade linear, (5–)15–25 × 1–1.5(–2) mm, base flat, not clasping, margins eglandular or glands minute.

Inflorescences

cymes monochasial, dense, sparingly branched, internodes sometimes all condensed or long proximally and condensed distally, flowers condensed at apices;

bract margins eglandular.

Pedicels

0.5–2(–5) mm, scarcely longer in fruit, ascending, not bent at apex.

Flowers

sepals erect, ± reflexed at tip, lanceolate, 3–4 mm, equal, margins minutely glandular, surfaces hairy, hairs intertwined or matted;

petals ± reflexed, pink to rose, oblanceolate, (3–)6–7(–8) mm, apex obtuse, sometimes slightly notched;

cup white, rim with petal attachments set in deep notches between filaments;

stamens exserted;

filaments 4–5 mm;

anthers rose to purple, dehisced anthers 1.5–2 mm;

ovary chambers 6;

styles 3, white, (3–)4–4.5(–5) mm, exserted.

2n

= 36.

Hesperolinon congestum

Phenology Flowering Apr–Aug.
Habitat Grasslands on serpentine soils.
Elevation 0–200 m. (0–700 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Hesperolinon congestum is known from a narrow band within the Outer Coast Ranges from Marin County south to San Mateo County. It can be distinguished from all other species in the genus by its hairy sepals.

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

Source FNA vol. 12, p. 402.
Parent taxa Linaceae > Hesperolinon
Sibling taxa
H. adenophyllum, H. bicarpellatum, H. breweri, H. californicum, H. clevelandii, H. didymocarpum, H. disjunctum, H. drymarioides, H. micranthum, H. sharsmithiae, H. spergulinum, H. tehamense
Synonyms Linum congestum
Name authority (A. Gray) Small: in N. L. Britton et al., N. Amer. Fl. 25: 86. (1907)
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