Silene acaulis
Silene serpentinicola
moss campion, silène acaule
serpentine catchfly, serpentine Indian pink
erect, leafy proximally, 3–6(–15) cm, old leaves persistent at base.
4–10(–15) cm, softly pubescent.
mostly basal, densely crowded and imbricate, sessile;
blade 1(–3)-veined, linear-subulate to lanceolate, 0.4–1(–1.5) cm × 0.8–1.5(–2) mm, margins cartilaginous, often ciliolate especially proximally, apex acute, glabrous to scabrous.
cauline in 4–8 pairs, crowded;
blade gray-green, oblanceolate to obovate, spatulate, 2.5–4.5 cm × 5–15 mm, longest near middle of stem, sparsely pubescent on both surfaces, reduced and bractlike on subterranean base.
solitary flowers.
terminal, 1–3(–4)-flowered cymes, densely glandular-pubescent;
bracts leaflike, (0.5–)0.7–1.1 cm.
2–40 mm.
ascending and straight, (5–)7–10 mm, glandular-pubescent.
bisexual or unisexual, all plants having both staminate and pistillate flowers, others having only pistillate flowers, subsessile or borne singly on peduncle;
calyx 10-veined, lateral veins absent, tubular to campanulate, (5–)7–10 mm, herbaceous, margins often purple tinged, dentate, sometimes ciliate, ± scarious, glabrous, lobes lanceolate to ovate, 1–2 mm;
petals bright pink, rarely white, limb unlobed to shallowly 2-fid, 2.5–3.5 mm, base tapered into claw, auricles and appendages poorly developed;
stamens exserted in staminate flowers, not so or aborted in pistillate flowers;
styles 3.
ca. 30 mm diam.;
calyx purple tinged, distinctly 10-veined, tubular, inflated and expanding in fruit, 13–17 mm, densely glandular-pubescent, lobes lanceolate;
corolla scarlet, clawed, limb carmine red, turning purple on drying, ± equally deeply 2-lobed, each lobe with lateral tooth, ca. 11 mm, glabrous, claw narrowly obtriangular, equaling calyx, appendages 2, prominent, petaloid, linear, truncate, 2.5–4.5 mm;
stamens long-exserted;
stigmas 3, long-exserted.
3-locular, cylindric, equaling or to 2 times calyx, opening by 6 recurved teeth;
carpophore ca. 1 mm.
ovoid to oblong, equaling calyx, (8–)12–15 mm;
carpophore 0.5–1 mm.
light brown, reniform, 0.8–1(–1.2) mm broad, dull, shallowly rugose.
dark brown, reniform, 1.8–2 mm diam., strongly papillate.
= 24.
= 72.
Silene acaulis
Silene serpentinicola
Silene acaulis is a variable species, and most workers have recognized infraspecific taxa in North America: subsp. acaulis (subsp. exscapa and subsp. arctica), which is predominantly arctic; and subsp. subacaulescens, which extends down the Rocky Mountains from Alaska to Arizona and New Mexico. In subsp. acaulis, the leaves are flat and short and the flowers are subsessile and smaller in size. Subspecies subacaulescens is typically a larger, less-compact plant with longer, narrower leaves and larger, pedunculate flowers. However, in many populations, these two variants are poorly differentiated, and in others both occur together, connected by intermediates.
Silene acaulis is widely distributed in arctic and alpine Europe.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Silene serpentinicola is a recently described endemic of the serpentines of the Smith River basin of northwestern Del Norte County and probably occurs on the same rock system across the border in Oregon. It differs from S. hookeri in flower color, and from both S. hookeri and S. laciniata subsp. californica in its erect, more or less solitary flowering stems and large, clearly visible petaloid appendages in the flowers.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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