Flora of North America species comparison

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Sidalcea hartwegii

Hartweg's checkerbloom, valley checkerbloom
Habit Herbs, annual, 0.1–0.4(–0.6) m, not glaucous, with taproot.
Stems

single, erect, unbranched or distally branched, often zigzag, solid, proximally usually glabrous or sparsely stellate-puberulent.
Leaves

cauline;

stipules deciduous or inconspicuous, sometimes purplish, subulate, 1–1.5(–3) × 0.5–1 mm;

petiole 0.5–1.5(–3) cm, usually 1/2 times involucellar bractlets absent.
Flowers

bisexual or unisexual and pistillate, plants gynodioecious;

calyx 8–10(–12) mm, not much enlarging in fruit, stellate-canescent, sparsely ciliate;

petals pink to rose-purple or white, pale-veined, often whitened at base, 18–20(–25) mm;

stamens: outer filaments incompletely connate, distally distinct, anthers not attached to connate portion of filaments;

staminal column 6–7 mm, hairy;

anthers white, stalked, aborted in pistillate flowers;

stigmas 6 or 7.
Seeds

1.5–2 mm.
Schizocarps

5–7 mm diam.;

mericarps 6 or 7, 2.5–4 mm, sides smooth, margins rugose, back reticulate-veined, deeply pitted especially on top, glabrous or glandular-puberulent, mucro 0.5–0.8(–1) mm.

Sidalcea hartwegii
Phenology Flowering (Mar–)Apr–Jun.
Habitat Dry to moist, grassy hillsides, foothill woodlands, vernal pools, often on serpentine
Elevation 30–800(–1000) m (100–2600(–3300) ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Sidalcea hartwegii is widespread in California from Tulare to Shasta counties, a range similar to those of the other vernal-pool annuals. It is most easily recognized by its stamen column, on which the anthers are borne on free portions of filaments, unlike in the other annual

species and more typical of the perennial species. This helps to support the suggestion that the annual species were separately derived and not part of a single lineage. Sidalcea hartwegii often grows with S. calycosa, from which it can be distinguished also by its rugose rather than deeply longitudinally furrowed dorsal mericarp surfaces.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 333.
Parent taxa Malvaceae > subfam. Malvoideae > Sidalcea
Sibling taxa
S. asprella, S. calycosa, S. campestris, S. candida, S. celata, S. covillei, S. cusickii, S. diploscypha, S. elegans, S. gigantea, S. glaucescens, S. hendersonii, S. hickmanii, S. hirsuta, S. hirtipes, S. keckii, S. malachroides, S. malviflora, S. multifida, S. nelsoniana, S. neomexicana, S. oregana, S. pedata, S. ranunculacea, S. reptans, S. robusta, S. setosa, S. sparsifolia, S. stipularis, S. virgata
Synonyms S. hartwegii var. tenella, S. tenella
Name authority A. Gray: Mem. Amer. Acad. Arts, n. s. 4: 20. (1849)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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