What’s a dichotomous key? Help

Danthonia

Danthonia sericea Nutt. was reported from MA by several recent sources, likely based originally on Hitchcock and Chase (1950). The voucher specimen was misidentified and is Danthonia spicata.

Choose this species
D. californica
1a. Spikelets (10–) 14–26 (–30) mm long; lemmas 5–10 mm long excluding the awns; apical teeth of lemma (2–) 4–6 (–7) mm long
See list of 2 species in 1b
CHOOSE THIS LEAD
1b. Spikelets 7–16 mm long; lemmas 2.5–5 mm long excluding the awns; apical teeth of lemma 0.5–4 mm long
- Choose this species
  D. spicata
  2a. Apical teeth of the lemma 0.5–2 mm long, triangular-acuminate [Fig. 207]; panicle 2–5 cm tall, crowded, the branches ascending to appressed after anthesis; pedicels shorter than or equaling the associated spikelets; leaf blades commonly involute, 0.8–2 (–3) mm wide, usually curling at maturity
- Choose this species
  D. compressa
  2b. Apical teeth of the lemma 2–4 mm long, aristate or setaceous [Fig. 206]; panicle 5–10 cm tall, open, the branches often divergent after anthesis; pedicels as long as or longer than the associated spikelets; leaf blades flat, 2–4 mm wide, not curling

Show All Couplets

Show photos of: Each photo represents one species in this genus.