rudimentary. Underdeveloped. 
scale. The reduced leaves at the base of a shoot. Said especially of 
the reduced or rudimentary leaves on a rhizome. 
seedstalk. The stem on which a grass seedhead develops. 
sessile. Without a stalk. Opposed to pediceled. 
sheath. The lower part of a grass leaf that encloses the stem. 
shoot. Individual stem and leaf growth. 
spathe. A large bract that encloses or partly encloses the seed- 
head, as in the bluestems. 
spike. An unbranched seedhead in which the spikelets are sessile 
on a rachis. 
spikelet. The basic unit of a grass seedhead, consisting of one or 
more florets and a pair of glumes. 
staminate. Applied to flowers bearing stamens only and to a plant 
with staminate (male) flowers. 
stolon. A horizontal, aboveground stem or runner that roots 
at nodes. 
subtend. To be below. 
succulent. Having juicy tissues. 
unisexual. Said of flowers containing only stamens or only pistils. 
warm-season grasses. Grasses that make their active growth dur- 
ing spring and summer. 
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