26. 
Alisma 
Alisma subcordatum Raf. Mud-plantain 
Ivy Neck. One station: shore of small cut-off pond on Cheston 
Peninsula, south of Sand Point. Hectare 5800. Associate species: 
Rumex verticillatus, Cephalanthus occidentalis, Echinochloa walteri, 
Galinsoga ciliata. Higman 946. 
Sagittaria 
Sagittaria latifolia Willd. 
var. pubescens (Muhl.) J. C. Sm. Duckpotato 
Java Farm. One station: dry, sandy bed of north fork of Muddy 
Creek, upstream from culvert of old entrance road, near barrier of 
piling (collected during drought). Hectare 2467. Canopy of Platanus 
occidentalis, Fagus grandifolia, and Liriodendron tulipifera. Under- 
story chiefly Lindera benzoin. Associate species: Impatiens capensis, 
Polygonum arifolium. Also observed in the freshwater part of Fox 
Creek marsh. Hectare 3526. Higman 1056. 
GRAMINEAE 
Key to the Tribes 
1. Spikelets 1- to many-flowered; articulation above the glumes 
except in Oryzeae. 
2. Plants woody; culms perennial.........eseeeceeeeeess Bambuseae (Expected) 
2, Plants herbaceous; culms annual. 
3. Spikelets 3-flowered, with 2 rudimentary florets 
below the perkect ONE. «cicie oie.e:s 0 e100 wishes cieleis siee ee ae (Nalarddeaem(pe. 28) 
3. Spikelets 1- to several-flowered, with no rudi- 
mentary florets below the perfect one (but 
sometimes above it). 
4. Spikelets unisexual; plants monoecious. 
5. Pistillate spikelets embedded in joints of 
the rachis... .sccscocscscoseseenssscseseee Lripsaceae (p. 28) 
