Flora of North America species comparison

few, descending, tuberous, mostly to 0.8 cm diam.

few–several, horizontal to descending, slenderly tuberous, to 1 cm diam.

fugaceous or rarely persisting to anthesis, basal, ascending, linear-lanceolate to oblanceolate, to 16 × 1.5 cm.

persisting through anthesis, usually restricted to base of stem, ascending, linear-lanceolate, to 28 × 1.5 cm.

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

rachis moderately pubescent, some trichomes capitate, glands obviously stalked (longest trichomes 0.2–0.52 mm).

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).

abruptly nodding from base, white to ivory, gaping, lip not strongly curving from claw, not urceolate;

sepals distinct to base, 5–14 mm;

lateral sepals wide-spreading, commonly ascending above flower;

petals linear to lance-oblong, 4.9–13 mm, apex acute to obtuse;

lip commonly yellow centrally, ovate to oblong, 4.9–12 × 3.3–7 mm, margins crenulate, glabrous;

veins several, branches parallel;

basal calli short-conic, mostly to 1 mm;

viscidia linear-lanceolate;

ovary 4–10 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.

= 30.

= 74.