Cyperus subg. Pycreus
Carices North. U. S., 517. 1847.
Basionym: Undefined subg. Pycreus Palisot de Beauvois Fl. Oware 2: 48. 1816
Synonyms: Cyperus sect. Pycreus (Palisot de Beauvois) Grisebach
Treatment appears in FNA Volume 23.
Culms and leaves with Kranz (chlorocyperoid) anatomy. Inflorescences: spikes; rachilla persistent, wingless or nearly so. Spikelets borne in loosely spicate to ± digitate clusters; floral scales deciduous, 2-keeled or folded. Flowers: stamens (1–) 2–3; pistils 2; stigmas 2. Achenes biconvex or ± cylindric, laterally compressed, edge borne toward rachilla.
Discussion
Species ca. 100 (11 in the flora).
Laterally compressed, biconvex achenes, a feature not occurring elsewhere in the family, distinguish Cyperus subg. Pycreus. The taxon has been treated as a genus in Flora Mesoamericana (C. D. Adams 1994), an idea that may have merit.
Selected References
None.
Lower Taxa
"shortened" is not a number.
... more about "Cyperus subg. Pycreus"
compressed;cylindric;biconvex +
basifixed +
decurrent +
absent +
1;many +
2;3 +
glabrous +
scabridulous +
Worldwide +
basal +
abundant +
distichous +
deciduous +
single +
bisexual +
pseudolateral +
pseudoumbel +
modified +
arranged +
basal +
absent +
fused +
falling +
absent +
with (1-)3-6(-30) bristles and/or scales +
thin +
2-3(-4)-carpellate +
fused +
pistillate +
subtending +
Carices North. U. S., +
1847 +
persistent +
singly +
unequal +
adventitious +
fibrous +
empty +
distichous +
0;76 +
fertile +
cylindric;compressed +
cylindric +
single +
cluster +
distinct +
papillate +
undivided +
2-3-fid +
Cyperus subg. Pycreus +
Cyperus +
subgenus +
free +
thin +
hyaline +
5;100 +