- Group 1Lycophytes, Monilophytes
- Group 2Gymnosperms
- Group 3Monocots
- Group 4Woody angiosperms with opposite or whorled leaves
- Group 5Woody angiosperms with alternate leaves
- Group 6Herbaceous angiosperms with inferior ovaries
- Group 7Herbaceous angiosperms with superior ovaries and zygomorphic flowers
- Group 8Herbaceous angiosperms with superior ovaries, actinomorphic flowers, and 2 or more distinct carpels
- Group 9Herbaceous angiosperms with superior ovaries, actinomorphic flowers, connate petals, and a solitary carpel or 2 or more connate carpels
- Group 10Herbaceous angiosperms with superior ovaries, actinomorphic flowers, distinct petals or the petals lacking, and 2 or more connate carpels
Lemma measurements should be made on the lower ones of a given spikelet. The orientation of panicle branches should be assessed when the plant is in fruit. Puccinellia nutkaensis (J. Presl) Fern. & Weatherby was reported from ME (under the name P. laurentiana Fern. & Weatherby) by Angelo and Boufford (1998); however, the specimen was in fact P. pumila— Somes Harbor, Rand s.n. ( MASS!). References: Hughes and Halliday (1980), Davis and Consaul (2007).
1b. Anthers 0.3–1.5 (–2) mm long; first glume 0.7–2.7 mm long; second glume 1.2–3 mm long; spikelets with 3–9 florets; plants not stoloniferous, or infrequently so in P. pumila (and then usually the result of buried stems)
2b. Inflorescence often open, at least the lower branches spreading or divergent; spikelets borne mostly in the apical portion of branches; lemma hyaline and weak at the apex, the midrib evanescent, usually not reaching the tip; anthers 0.7–1.5 mm long
3b. Branches of the panicle prominently scabrous; distal margin of the lemma prominently scabrous-ciliate [Fig. 264]; caryopsis 1–1.6 mm long
Show photos of: Each photo represents one species in this genus.