What’s a dichotomous key?
Help
Section Racemosae
See list of 3 species in this section-
1a. Lowermost carpellate spikes spreading or drooping on long peduncles 10–40 mm long; perigynia dark brown to dark red-brown at maturity; achene filling basal ½ of perigynium or less
-
1b. Lowermost carpellate spikes ascending to erect, sessile or on short peduncles less than 10 mm long; perigynia pale green to white-green or pale brown to yellow-brown at maturity; achene nearly filling body of perigynium
-
2a. Stems aphyllopodic, arising in tufts from long, horizontal rhizomes; perigynia gray-green or white-green, papillose; carpellate scales usually equaling or exceeding the perigynia; carpellate spikes 10–25 mm long, not forming a dense apical cluster
-
2b. Stems phyllopodic and cespitose, arising from leafy tufts, without elongate rhizomes; perigynia pale green becoming gold-brown, smooth or inconspicuously papillose; carpellate scales usually shorter than the perigynia; carpellate spikes 5–12 mm long, the upper spikes densely aggregated
-
Show photos of:
Each photo represents one species in this section.