Flora of North America species comparison

few, horizontally spreading, slender, mostly to 0.4 cm diam.

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

persisting through anthesis, basal, sometimes on basal portion of stem, spreading, linear-oblanceolate to narrowly elliptic, to 21 × 2 cm.

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

rather loosely to very tightly spiraled, 3–4 flowers per cycle of spiral, occasionally 5 or more in very loose spiral;

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

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).

ochroleucous, ivory, creamy, yellowish, or greenish white, ascending, urceolate to somewhat gaping, claw of lip at pronounced (20–60°) angle to lamina, base cuneate, appearing strongly inflated;

sepals distinct to base, 6–14 mm;

lateral sepals appressed to petals and lip, straight, separated from dorsal sepal by mostly 0.7–1 mm;

petals linear to linear-oblong, 6–13 mm, apex acute to obtuse;

lip often more yellow centrally, oblong to ovate, 7–12 × 4–7 mm, margins crenulate, glabrous;

veins several, branches parallel;

basal calli incurved, prominent, very rarely conic, 1–2 mm;

viscidia linear;

ovary 3–7 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.