Spiranthes diluvialis

Sheviak

Brittonia 36: 11, figs. 1C, D, 2A–C, F. 1984.

IllustratedEndemicConservation concern
Synonyms: Spiranthes romanzoffiana var. diluvialis (Sheviak) S. L. Welsh
Treatment appears in FNA Volume 26. Mentioned on page 544.

Plants 20–62 cm. Roots few–several, horizontal to descending, slenderly tuberous, to 1 cm diam. Leaves persisting through anthesis, usually restricted to base of stem, ascending, linear-lanceolate, to 28 × 1.5 cm. Spikes usually tightly spiraled, 3 flowers per cycle of spiral, rarely loosely spiraled with more than 4 flowers per cycle; rachis sparsely (rarely densely) pubescent, some trichomes capitate, glands obviously stalked (longest trichomes 0.2–0.4 mm). Flowers white or ivory, ascending, strongly gaping from near base (lip prominently diverging from sepals and petals); sepals distinct or connate at base, 7.5–15 mm; lateral sepals broadly spreading to loosely incurved, often raised above rest of flower or often appressed; petals linear, apex acuminate; lip often yellow centrally, ovate, lanceolate, or oblong, with variably evident median constriction, occasionally subpandurate, 7–12 × 2.5–6.8 mm, margins crisped, entire, or apically dentate, distal surface mostly glabrous adaxially; basal calli prominent; veins few to several, branches parallel to wide-spreading; viscidia linear to linear-lanceolate; ovary mostly 4–10 mm. Seeds monoembryonic. 2n = 74.


Phenology: Flowering Jul–Aug(–Sep).
Habitat: Mesic to wet riparian meadows, marshes, stream banks
Elevation: 1300–1800 m

Distribution

V26 1111-distribution-map.jpg

Colo., Idaho, Mont., Nebr., Nev., Utah, Wash., Wyo.

Discussion

Of conservation concern.

Spiranthes diluvialis is an amphiploid product of hybridization of S. romanzoffiana and S. magnicamporum. It is correspondingly somewhat variable in individual characters, but specimens can be determined through consideration of a combination of features. The position of lateral sepals commonly varies within an inflorescence, and on the same flower one is often tightly appressed while the other is widespreading and ascending. Lip venation in particular can be helpful, as most branches are parallel, but often a few are wide-spreading.

Lower Taxa

None.
... more about "Spiranthes diluvialis"
Charles J. Sheviak +  and Paul Martin Brown +
Sheviak +
Colo. +, Idaho +, Mont. +, Nebr. +, Nev. +, Utah +, Wash. +  and Wyo. +
1300–1800 m +
Mesic to wet riparian meadows, marshes, stream banks +
Flowering Jul–Aug(–Sep). +
sheviak1984a +
Illustrated +, Endemic +  and Conservation concern +
Spiranthes romanzoffiana var. diluvialis +
Spiranthes diluvialis +
Spiranthes +
species +