Spiranthes delitescens Sheviak
Family: Orchidaceae
delightful ladiestresses,  more...
Spiranthes delitescens image
Jim Rorabaugh, U.S. Fish & Wildlife Service  
Plants 20-48 cm. Roots few-several, descending, slenderly tuberous, to 5 mm diam. Leaves persisting through anthesis, basal, on proximal 1/2 of stem, ascending to spreading, linear-lanceolate to oblanceolate, to 18 × 1.5 cm (rarely wider). Spikes loosely to tightly spiraled, 3 flowers per cycle of spiral; rachis rather densely pubescent, trichomes without glands pointed, glandular obviously stalked, glands equaling or narrower than stipes. Flowers curving through horizontal, white, somewhat gaping and open with wide-spreading lateral sepals; sepals usually connate at base, 6.5-8(-9.9) mm; lateral sepals curving outward throughout lengths, usually directed somewhat downward; petals linear to linear-oblanceolate, apex obtuse; lip creamy or very pale yellow centrally, oblong, with variably evident median constriction, 5.8-7.9 × 3.2-4.9 mm, apex broadly expanded with extensive transverse pleats, distal surface mostly glabrous adaxially; basal calli prominent, stout; veins few, branches mostly wide-spreading; viscidia linear to linear-lanceolate; ovary 3-6 mm. Seeds monoembryonic. 2n = 74. Flowering Jul--Aug. Cienegas, wet riparian meadows, stream banks; of conservation concern; 1400--1500 m; Ariz. Spiranthes delitescens is an amphiploid product of hybridization of species in the n = 15 and n = 22 lineages. Although its origin is unknown, on morphologic grounds C. J. Sheviak (1990) proposed S. vernalis and S. porrifolia as possible parents.

Spiranthes delitescens image
Flora of North America  
The National Science Foundation
This project made possible by National Science Foundation Award 1410069