keys to the vascular plants of east texas - Botanical Research ...

CAREX/CYPERACEAE
525
85. Larger perigynia 3.2–4.1(–4.5) mm long; style base usually
conspicuously bent or reflexed _______________________ C. glaucodea
84. Veins raised on faces of the perigynia.
86. Perigynia 1.6–2.5 mm wide, with about 12 veins, the
perigynia bodies rounded at base, loosely enveloping
achene at maturity _________________________________ C. granularis
86. Perigynia 1–1.7(–1.8) mm wide, with 14 or more veins, the
perigynia bodies tapered at base, closely enveloping achene
at maturity.
87. Perigynia faces concave, plane, or slightly convex; lowest
pistillate spike near base of plant _________________ C. digitalis
88. Staminate spike overtopped by first pistillate bract;
tallest flowering culm equal to or shorter than foliage;
perigynia with 10–14 veins per face ___________ C. digitalis
var. floridana
88. Staminate spike overtopping first pistillate bract;
tallest flowering culm usually overtopping foliage;
perigynia with 6–12 veins per face _______________ C. digitalis
var. macropoda
87. Perigynia faces convex, especially proximally; lowest pistillate
spike not near base of plant.
89. Distal lateral spikes narrower than their subtending
bracts and concealed by them when viewed
from below __________________________________ C. kraliana
89. Distal lateral spikes wider than their subtending
bracts and not concealed by them when viewed
from below.
90. Perigynia obovoid, 2.4–2.6 mm long, 1–1.7 times
longer than wide, with a short, abruptly bent
beak _____________________________________ C. blanda
90. Perigynia fusiform, 3.4–5 mm long, 2–3 times
longer than wide, tapering into a curved, more
or less elongate beak.
91. Perigynia yellowish at maturity and pale
greenish when young; 1–2 pistillate spikes
overtopping the peduncle of the staminate
spike _______________________________ C. crebriflora
91. Perigynia green or greenish; peduncles of
the staminate spike overtopping pistillate
spikes (at least most do).
92. Perigynia loosely overlapping, ca. 6–7 in
a 1 cm span; leaf blades of flowering
culms 2–7 mm wide; lowest spike with
an erect or ascending peduncle ________ C. striatula
92. Perigynia closely overlapping, ca. 10–12
in a 1 cm span; leaf blades of flowering
culms 2.5–3.5 mm wide; lowest spike
on a long, drooping, capillary peduncle
_________________________________ C. styloflexa
82. Most of the beaks of perigynia straight, not bent.
93. Plants with elongate creeping rhizomes _____________________ C. microdonta