Cyperus sphaerolepis

Boeckeler

Linnaea 35: 609. 1868.

Common names: Rusby’s sedge
Illustrated
Synonyms: Cyperus fendlerianus var. debilis (Britton) Kükenthal Cyperus fendlerianus var. leucolepis (Boeckeler) Kükenthal Cyperus leucolepis Britton Cyperus rusbyi Torrey Cyperus schweinitzii var. debilis Britton
Treatment appears in FNA Volume 23. Treatment on page 177. Mentioned on page 144, 147, 176.

Herbs, perennial, rhizomatous. Culms basally cormlike, trigonous, (8–) 15–40 (–60) cm × (0.4–) 0.8–1.5 (–2) mm, glabrous or sparsely to densely scabridulous to minutely scabrid on angles or usually on surface, just proximal to bracts or over distal few centimeters. Leaves (1–) 3–4, V-shaped, (7–) 15–25 (–40) cm × 1–3 (–5) mm, sparsely minutely scabridulous on margins and keel in distal 1/3, otherwise glabrous. Inflorescences: spikes 1–3, sessile (occasionally 1 spike on peduncle 5–20 cm, produced from axil of distalmost leaf), loosely cylindric to oblong-ovoid, (9–) 15–30 (–45) × (3–) 8–15 (–18) mm; bracts 2–3 (–7), longest erect, or very nearly so, others spreading, (1–) 3–20 (–26) cm × (0.5–) 1–3 (–5) mm; rays (1–) 2–6 (–11), (1–) 2–7 (–12) cm, in some depauperate plants rays less than 1 cm; rachilla ± deciduous, wingless. Spikelets (4–) 8–25 (–35), oblongellipsoid to linear, compressed-quadrangular, (2–) 7–11 (–15) × (2–) 2.4–3.2 (–3.5) mm; floral scales (1–) 4–8 (–14), laterally dull whitish, stramineous, or light-brown, or reddish-brown to deep red, often red-dotted especially near keel, medially greenish, broadly ovate-deltate to ± orbiculate, laterally strongly 3 (–4) -ribbed, medially weakly 1–3-ribbed, (1.6–) 1.8–2.4 × (1.8–) 2.2–2.8 mm, margins clear, erose especially apically, apex obtuse, tipped with straight mucro 0.1–0.2 (–0.3) mm. Flowers: anthers 0.4–0.6 mm; styles 0.4 (–0.8) mm; stigmas 0.6–1 mm. Achenes finely reticulate with isodiametric cells, this layer gradually wearing away to reveal inner brown to reddish-brown layer, stipitate, ovoid to obovoid, 1.4–1.6 (–1.9) × 1–1.3 (–1.4) mm, base cuneate to ± attenuate, stipe 0.1–0.2 × 0.2 mm, apex obtuse, slightly apiculate, inner layer papillose.


Phenology: Fruiting summer.
Habitat: Clearings in montane forests
Elevation: 1000–2500 m

Distribution

V23 298-distribution-map.jpg

Ariz., N.Mex., Tex., Mexico

Discussion

Cyperus sphaerolepis has long been known by the synonym C. rusbyi and has been treated as a variety of C. fendlerianus. Specific status for C. sphaerolepis is supported by B. G. Marcks (1972) and G. C. Tucker (1994).

Selected References

None.

Lower Taxa

None.

"shortened" is not a number."longest" is not a number.

... more about "Cyperus sphaerolepis"
flattened;trigonous +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
obtuse;obtuse +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Boeckeler +
persistent +  and deciduous +
cuneate +  and more or less attenuate +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
parallel +  and divergent +
terete +, rolled +  and plicate +
Rusby’s sedge +
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
15 cm150 mm <br />0.15 m <br /> (40 cm400 mm <br />0.4 m <br />) +
sparsely to densely +  and glabrous +
scabridulous +  and minutely scabrid +
trigonous +
0.8mm;1.5mm +
Ariz. +, N.Mex. +, Tex. +  and Mexico +
1000–2500 m +
1-3-ribbed +  and 3(-4)-ribbed +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
greenish +, red-dotted +, light-brown or reddish-brown +  and deep red +
deciduous +  and persistent +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
broadly ovate-deltate +  and more or less orbiculate +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Clearings in montane forests +
subumbellate +  and capitate +
spreading +  and erect +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
reddish-brown +, brown +  and inner +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
1mm;1.3mm +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
25 cm250 mm <br />0.25 m <br /> (40 cm400 mm <br />0.4 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
15 cm150 mm <br />0.15 m <br /> (?) +  and 25 cm250 mm <br />0.25 m <br /> (?) +
scabridulous +
v--shaped +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
straight +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
20 cm200 mm <br />0.2 m <br /> (26 cm260 mm <br />0.26 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
3 cm30 mm <br />0.03 m <br /> (20 cm200 mm <br />0.2 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
conspicuous +
7 cm70 mm <br />0.07 m <br /> (12 cm120 mm <br />0.12 m <br />) +
unequal +
2 +  and 6 +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
Illustrated +
3 cm30 mm <br />0.03 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
loosely cylindric;oblong-ovoid +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
8 +  and 25 +
compressed-quadrangular +
2.4mm;3.2mm +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (?) +  and 0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (?) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
2-3-fid +
0.4 cm4 mm <br />0.004 m <br /> (?) +
Cyperus fendlerianus var. debilis +, Cyperus fendlerianus var. leucolepis +, Cyperus leucolepis +, Cyperus rusbyi +  and Cyperus schweinitzii var. debilis +
Cyperus sphaerolepis +
Cyperus subg. Cyperus +
species +