Flora of North America species comparison

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

few–several, horizontal to descending, slenderly tuberous, to 1 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, usually restricted to base of stem, ascending, linear-lanceolate, to 28 × 1.5 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.

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).

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.

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.

monoembryonic.

monoembryonic.

= 44 [66].

= 74.