Sidalcea oregana subsp. eximia

(Greene) C. L. Hitchcock

Perenn. Sp. Sidalcea, 66. 1957.

Common names: Humboldt checkerbloom
Conservation concernEndemic
Basionym: Sidalcea eximia Greene Cybele Columb. 1: 34. 1914
Treatment appears in FNA Volume 6. Treatment on page 349. Mentioned on page 348, 350, 351, 354.

Plants 0.9–1.5 m, with short, thick, rather woody taproot and branching caudex. Stems sometimes rooting at base, usually branched distally, often hollow but firm, base conspicuously densely bristly, hairs simple with swollen base, 1–2.5 mm. Leaves: stipules lanceolate, 10–14 × 2 mm; petioles of basal and proximal leaves (5–) 10–20 (–30) cm, 3–4+ times as long as blade, reduced distally and distalmost leaves nearly sessile; blade reniform-orbiculate, cordate, unlobed and margins merely crenate or shallowly 5–7 (–9) -lobed, 3–9.5 (–12) × 3–13 cm, blades distally all deeply 5–7-lobed essentially to base, hairs simple on both sides, 1–1.5 mm, distalmost blades usually 5-parted with irregularly-toothed lobes. Inflorescences spiciform, dense, calyces usually overlapping, branched, 20+-flowered, 3–8 cm, little elongating in fruit, flowers and fruits overlapping; primary peduncles (above distalmost leaf) usually equaling or shorter than mature inflorescence; bracts linearlanceolate, undivided, 7 mm, usually longer than young flower buds and conspicuous then, much longer than pedicels, shorter than to nearly equaling calyx. Pedicels 1–2 mm. Flowers bisexual; calyx 8–10 mm, to 13 mm in fruit, stellate-puberulent, conspicuously bristly-tomentose especially on base, hairs 1.5–2.5 mm; petals pink, 15–16 mm; staminal column 9 mm, hirtellous-hairy; anthers white; stigmas 7–9. Schizocarps 5–6 mm diam.; mericarps 7–9, 2.5 mm, sparsely puberulent with a few bristles, smooth or nearly so, margins rounded, mucro 0.5–0.7 mm. Seeds 2 mm.


Phenology: Flowering Jun–Aug(–Sep).
Habitat: Meadow openings, prairies
Elevation: 0–1200 m

Discussion

Subspecies eximia is uncommon and somewhat obscure. It was recognized by Hitchcock because of its notably accrescent and long-hirsute calyces and its robust habit and narrow range. It clearly intergrades with subsp. spicata and also strongly resembles Sidalcea setosa. There are no recent collections of subsp. eximia and only a limited number of older ones; it may be extirpated. It is known from the northern coast and North Coast Ranges in Humboldt County.

Of conservation concern.

Selected References

None.

Lower Taxa

None.

"elongating" is not a number.

60 +, 40 +  and 20 +
Steven R. Hill +
(Greene) C. L. Hitchcock +
swollen +
Sidalcea eximia +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
5-7-lobed +, unlobed +, cordate +  and reniform-orbiculate +
3cm;10cm +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
much longer +  and usually longer +
conspicuous +
divided +, undivided +  and 2-fid +
20+-flowered +  and branched +
overlapping +
1.5 cm15 mm <br />0.015 m <br /> (10 cm100 mm <br />0.1 m <br />) +
bristly-tomentose +  and stellate-puberulent +
0 cm0 mm <br />0 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
indehiscent +  and loculicidal +
Humboldt checkerbloom +
3(-5)-lobed +  and unlobed +
0–1200 m +
sparse;copious +
pistillate +, 10-20+-flowered +, unbranched +, few-branched +  and open +
overlapping +
Meadow openings, prairies +
stellate +  and forked +
minute +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
axillary +  and terminal +
tough-fibrous +
connate +  and distinct +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
distichous +  and alternate +
10 cm100 mm <br />0.1 m <br /> (35 cm350 mm <br />0.35 m <br />) +
3-5 times as long as blades +
7 cm70 mm <br />0.07 m <br /> (10 cm100 mm <br />0.1 m <br />) +
cauline +  and basal +
irregularly-toothed +
reticulate-veined +  and smooth +
entire +  and serrate +
9.5 cm95 mm <br />0.095 m <br /> (12 cm120 mm <br />0.12 m <br />) +
3cm +  and 9.5cm +
rounded;5-7(-9)-lobed;crenate +
3cm +  and 13cm +
wedge--shaped +
2.5 cm25 mm <br />0.025 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
(3-)5-9-lobed +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
3-40-carpellate +
(1-)2-many +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pistillate +  and pale-veined +
overlapping +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
adnate +  and distinct +
1.5 cm15 mm <br />0.015 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
3-4+ times as long as blade +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
Flowering Jun–Aug(–Sep). +
Perenn. Sp. Sidalcea, +
elongated +
5mm +  and 6mm +
hairy +  and glabrous +
reniform +
Lobed (?) +  and Unlobed (?) +
persistent +
Conservation concern +  and Endemic +
sessile +  and subsessile +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
9 cm90 mm <br />0.09 m <br /> (?) +
hollow +, branched +  and rooting +
7 +  and 9 +
filiform +, linear +  and capitate +
1-2 times number of carpels +
0.6 cm6 mm <br />0.006 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
2 cm20 mm <br />0.02 m <br /> (?) +
unbranched +  and branched +
hairy +  and glabrous +
Hesperalcea +
Sidalcea oregana subsp. eximia +
Sidalcea oregana +
subspecies +
not +  and glaucous +