Sidalcea nelsoniana

Piper

Proc. Biol. Soc. Wash. 32: 41. 1919.

Common names: Nelson’s checkerbloom
Conservation concernEndemic
Treatment appears in FNA Volume 6. Treatment on page 346. Mentioned on page 320, 323, 324, 328, 330, 351.

Herbs, perennial, 0.4–1 m, often glaucous, with thick, woody taproot and lateral rhizomes to 500 mm. Stems clustered, erect, base decumbent-ascending, solid or ± hollow in age, usually ± glaucous distally, glabrous or sparsely hirtellous, hairs short, appressed, simple. Leaves basal and cauline; stipules sometimes deciduous, lanceolate to ovate, (4–) 7–9 (–14) × (1.2–) 3–4 mm; petioles of proximal leaves 18–37 cm, 3–5 times as long as blades, distal 5–20 cm, to 1/2–1 times as long as blades; blades: basal reniform to rounded, unlobed and marginally deeply crenate or very shallowly palmately 5–7-lobed, 6–20 × 6–20 cm, base cordate, apex rounded; cauline deeply 5–9-lobed, lobes linear-elliptic to oblongelliptic, margins usually entire, sometimes toothed, surfaces finely, sparsely hairy, hairs mostly simple. Inflorescences erect, spiciform, proximally open, distally dense, otherwise calyces not conspicuously overlapping except sometimes in bud, branched, 20+-flowered, proximalmost flowers spaced usually to 1 cm apart, not leafy-bracted, elongate, not 1-sided, 10–20 cm; bracts single, purple, mm, hairy; anthers white; stigmas (6 or) 7 or 8. Schizocarps 4–5 mm diam.; mericarps (6 or) 7 or 8, 2 mm, roughened, sparsely glandularpuberulent apically, sides finely reticulate to faintly rugose, sometimes also on back, to nearly smooth, not pitted, mucro 0.5–1 mm. Seeds 1.5 mm. 2n = 20.


Phenology: Flowering (May–)Jun–Jul(–Sep).
Habitat: Open fields, meadows, fencerows, remnant prairies
Elevation: (40–)100–600(–1300) m

Discussion

Of conservation concern.

Sidalcea nelsoniana is uncommon and persists generally in degraded habitats. It resembles S. campestris and S. virgata, with similar ranges, but is generally less hairy and has a smaller, usually purplish calyx. It has been listed as endangered in Washington and as threatened in Oregon; the number of populations and individuals has greatly declined as a result of land development. It is found in the Willamette Valley area from Multnomah and Washington to Benton and Linn counties in Oregon, and in Cowlitz and Lewis counties in Washington.

Sidalcea nelsoniana is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.

"-1/2-1timesaslongasblades" is not declared as a valid unit of measurement for this property."elongated" is not a number.

... more about "Sidalcea nelsoniana"
rounded +
Steven R. Hill +
6 cm60 mm <br />0.06 m <br /> (20 cm200 mm <br />0.2 m <br />) +
5-7-lobed +, crenate +, unlobed +, reniform +  and rounded +
6 cm60 mm <br />0.06 m <br /> (20 cm200 mm <br />0.2 m <br />) +
hollow +  and solid +
decumbent-ascending +
hirtellous +, glabrous +  and glaucous +
cordate +
asymmetric +  and symmetric +
dissected +, lobed +  and unlobed +
20+-flowered +  and branched +
overlapping +
indehiscent +  and loculicidal +
Nelson’s checkerbloom +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
Oreg. +  and Wash. +
(40–)100–600(–1300) m +
sparse;copious +
pistillate +  and staminate +
unisexual +  and bisexual +
Open fields, meadows, fencerows, remnant prairies +
open +  and spiciform +
axillary +  and terminal +
tough-fibrous +
connate +  and distinct +
0 cm0 mm <br />0 m <br /> (50 cm500 mm <br />0.5 m <br />) +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
distichous +  and alternate +
3-5 times as long as blades +
18 cm180 mm <br />0.18 m <br /> (37 cm370 mm <br />0.37 m <br />) +
cauline +  and basal +
linear-elliptic +  and oblongelliptic +
wedge--shaped +
2 cm20 mm <br />0.02 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
not pitted +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
3-40-carpellate +
(1-)2-many +
adnate +  and distinct +
Flowering (May–)Jun–Jul(–Sep). +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
Proc. Biol. Soc. Wash. +
4mm +  and 5mm +
hairy +  and glabrous +
reniform +
1.5 cm15 mm <br />0.015 m <br /> (?) +
persistent +
finely reticulate;faintly rugose +
Conservation concern +  and Endemic +
sessile +  and subsessile +
8 +  and 7 +
filiform +, linear +  and capitate +
1-2 times number of carpels +
0.9 cm9 mm <br />0.009 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
lanceolate +  and ovate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
unbranched +  and branched +
Hesperalcea +
Sidalcea nelsoniana +
Sidalcea +
species +
monoecious +, dioecious +  and hermaphroditic +