Sidalcea hendersonii

S. Watson

Proc. Amer. Acad. Arts 23: 262. 1888.

Common names: Henderson’s checkerbloom
Endemic
Treatment appears in FNA Volume 6. Treatment on page 334. Mentioned on page 320, 322, 328, 330.

Herbs, perennial, 0.5–1.5 m, not glaucous, sparsely hairy to nearly glabrous throughout, with woody taproot and short, thick, ascending rootstock, usually also with compact rhizomes to 10 mm diam. Stems usually several, clustered, erect, usually purplish tinted especially near base, mostly unbranched, sometimes proximally hollow, base glabrous or sparsely hairy, hairs minute, simple or stellate, more densely scabrous distally. Leaves basal and cauline, ± fleshy; stipules deciduous, often purplish, lanceolate to linear, 6–11 × 1–3 mm; petiole often purplish tinted, those of basal leaves to 30 cm, proximalmost 3 times as long as blades, mid cauline 1–2 times as long as blades, distalmost to 1/2 times as long as blades and leaves subsessile; basal blades orbiculate, unlobed or shallowly 5-lobed, 7–15 × 7–15 cm, margins crenate or dentate, ciliate, surfaces glabrous or sparsely hirsute, hairs sometimes forked, not stellate, mid cauline palmately 7–9-lobed, incised 1/2+ length, 7–12 (–17) × 7–12 (–17) cm, lobes cuneate, margins coarsely dentate to pinnatifid, apex toothed, surfaces: adaxial sparsely hairy or only on veins, ciliate, distal cauline leaves 3–5-parted nearly to base, lobes narrowly lanceolate to linear, margins coarsely dentate-laciniate. Inflorescences erect, spiciform, dense, especially when young, sometimes elongate, calyces usually conspicuously overlapping in flower and sometimes in fruit, usually branched, 20-flowered, usually several to many open at same time, not 1-sided, 5–20 cm; bracts purplish, lanceolate to linear, undivided, rarely 2-fid, 4–5 mm, longer than pedicels, shorter than calyx. Pedicels 1–4 mm, to 7–8 mm in fruit; involucellar bractlets absent. Flowers bisexual or often unisexual and pistillate, plants gynodioecious; calyx somewhat urceolate, 8–9 mm, to 10–12 mm in fruit, lobes strongly reticulate-veined, sparsely stellate-hairy or proximally glabrous, lobe tips usually purple, rarely green, margins ciliate; petals bright pinkish lavender, drying deep purple, veins not paler, bases not white, pistillate usually 8–10 mm, bisexual (10–) 15–20 mm; staminal column 6–7 mm, hairy; anthers white; stigmas (5–) 7 or 8 (or 9). Schizocarps 8–9 mm diam.; mericarps (5–) 7 or 8 (or 9), 4 mm, smooth, glabrous (rarely sparsely glandularpuberulent), thin-walled, apical margins sharpedged, not winged, back sometimes slightly wrinkled, mucro 0.8–1.3 mm. Seeds 3 mm. 2n = 20.


Phenology: Flowering Jun–Aug.
Habitat: Coastal marshes, sandy to boggy tidal areas, upper beach meadows
Elevation: 0–50 m

Distribution

V6 604-distribution-map.jpg

B.C., Alaska, Oreg., Wash.

Discussion

Sidalcea hendersonii is showy and distinctive; it has been confused with S. oregana subsp. spicata and with S. cusickii, to which it is similar and apparently closely related. Like S. cusickii, S. hendersonii generally has purplish tinted vegetative parts, compact inflorescences with flowers that are mostly open at the same time, and ciliate calyx lobes. Sidalcea hendersonii is generally considered vulnerable; the number of extant populations has declined in recent decades, especially in Oregon, where it is close to extirpation. It can be distinguished by its marshy seacoast habitat, its often hollow stems, its tendency to be glabrous, its dense, compound inflorescences, and its relatively large mericarps and mucro. It is the northernmost species of Sidalcea and is the one better adapted to brackish or saline marshes. Sidalcea hendersonii occurs from Douglas County, Oregon, to British Columbia, and a single specimen is known from Alaska.

Selected References

None.

Lower Taxa

None.

"elongated" is not a number.

... more about "Sidalcea hendersonii"
toothed +
Steven R. Hill +
S. Watson +
7 cm70 mm <br />0.07 m <br /> (15 cm150 mm <br />0.15 m <br />) +
5-lobed +, unlobed +  and orbiculate +
7 cm70 mm <br />0.07 m <br /> (15 cm150 mm <br />0.15 m <br />) +
hairy +  and glabrous +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
asymmetric +  and symmetric +
dissected +, lobed +  and unlobed +
2-fid +, lanceolate +  and linear +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
open +, 20-flowered +  and branched +
overlapping +
usually several;many +
urceolate +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
indehiscent +  and loculicidal +
Henderson’s checkerbloom +
B.C. +, Alaska +, Oreg. +  and Wash. +
0–50 m +
sparse;copious +
unisexual +  and bisexual +
Coastal marshes, sandy to boggy tidal areas, upper beach meadows +
not stellate +  and stellate +
12 cm120 mm <br />0.12 m <br /> (17 cm170 mm <br />0.17 m <br />) +
12 cm120 mm <br />0.12 m <br /> (17 cm170 mm <br />0.17 m <br />) +
7cm +  and 12cm +
cauline +  and mid +
incised +, 7-9-lobed +  and forked +
minute +
7 cm70 mm <br />0.07 m <br /> (?) +  and 12 cm120 mm <br />0.12 m <br /> (?) +
axillary +  and terminal +
tough-fibrous +
connate +  and distinct +
distichous +  and alternate +
purplish tinted +
cauline +  and basal +
reticulate-veined +
glabrous +  and stellate-hairy +
narrowly lanceolate +  and linear +
dentate-laciniate;coarsely dentate;pinnatifid +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
wedge--shaped +
4 cm40 mm <br />0.04 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
3-40-carpellate +
(1-)2-many +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
bright pinkish +
adnate +  and distinct +
Flowering Jun–Aug. +
Proc. Amer. Acad. Arts +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
8mm +  and 9mm +
hairy +  and glabrous +
reniform +
3 cm30 mm <br />0.03 m <br /> (?) +
persistent +
sessile +  and subsessile +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
hollow +  and unbranched +
purplish tinted +
8 +  and 7 +
filiform +, linear +  and capitate +
1-2 times number of carpels +
0.6 cm6 mm <br />0.006 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
lanceolate +  and linear +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
unbranched +  and branched +
hirsute +  and glabrous +
Hesperalcea +
Sidalcea hendersonii +
Sidalcea +
species +
plant +  and herb +
sparsely hairy +  and nearly glabrous +