Flora of North America species comparison

few–several, spreading to descending, tuberous, mostly to 1 cm diam.

several, horizontally spreading, slender, mostly to 0.3 cm diam.

persisting through anthesis or fugaceous, basal, often on proximal portion of stem, ascending, linear to linear-lanceolate, linear-oblanceolate, oblanceolate or elliptic, to 34 × 3.5 cm.

persisting through anthesis, basal, gradually or occasionally abruptly reduced upward on stem, base of blade sheathing stem or narrowed to broad petiole over 7 mm wide, ascending to spreading (rigidly so because of aerenchymatous thickening of blade);

blades on proximal cauline sheaths spreading-recurved, frequently also on distal (then extending to inflorescence), elliptic to oblong- or linear-oblanceolate, to 52 × 4 cm.

usually very tightly spiraled, rarely loosely spiraled, usually 3 flowers per cycle of spiral;

rachis glabrous to sparsely pubescent, trichomes less (usually much less) than 0.18 mm, capitate glands often sessile.

tightly spiraled, 3–4 flowers per cycle of spiral;

rachis moderately pubescent, some trichomes capitate, glands obviously stalked.

ascending, creamy to markedly yellowish, slenderly tubular;

sepals connate at base, 4.6–11 mm, apex reflexed-spreading;

petals linear-lanceolate to linear-oblanceolate, apex reflexed-spreading, obtuse to subacute or subemarginate;

lip lance-ovate to lanceolate, 4–9.5 × 1.9–4.3 mm, apex recurved less than to scarcely more than apices of sepals and petals, only slightly or not at all dilated, with subapical dense cushion of peg-shaped trichomes on adaxial surface;

veins few to several, branches wide-spreading or often parallel;

viscidia linear to linear-elliptic;

ovary mostly 2–7.5 mm.

nodding, white, urceolate to gaping, claw of lip at low (less than 30°) angle to lamina, base appearing only slightly inflated;

sepals distinct to base, 4–18 mm;

lateral sepals loosely associated with dorsal and petals or spreading, sometimes arching above flower;

petals lanceolate to elliptic-lanceolate, 4–18 mm, apex acute to obtuse or emarginate;

lip often yellow or green centrally, rhombic-ovate to ovate or lance-ovate, 4–16 × (4–)7–9.5 mm, fleshy, margins lacerate-crenulate, glabrous;

veins several, branches parallel;

basal calli incurved, prominent, sometimes conic in small flowers, 0.2–2.5 mm;

viscidia linear to linear-lanceolate;

ovary 4–8 mm.

monoembryonic.

monoembryonic.

= 44 [66].

= 30.