Flora of North America species comparison

fleshy, villous.

succulent, glabrous.

cauline, sessile [petiolate], not articulate;

blade convolute, conduplicate, often membranous.

terminal, dense spikes [racemes];

flowers spirally arranged;

floral bracts mostly longer than flowers, membranaceous, scarious.

few–many, resupinate, white with yellow lip, small, scarcely opening;

sepals subequal;

dorsal sepal erect, connivent with petals, forming hood over column;

lateral sepals distinct and free, enclosing base of lip;

lip pandurate, broadly rounded, margins entire, apex slightly broadened to winglike;

column short;

anther abaxial, 2-chambered, membranous;

pollinia 2, sometimes 2-lobed, pyriform, sectile, caudicles present or absent;

stigmas 2, on either side of column, convex;

rostellum large, deeply divided.

capsules, erect, ovoid [subglobose].