Scirpus congdonii

Britton

Torreya 18: 36, fig. 1. 1918.

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 16. Mentioned on page 10, 17.

Plants spreading; rhizomes tough, slender. Culms: fertile ones upright or nearly so; nodes without axillary bulblets. Leaves 4–8 per culm; sheaths of proximal leaves green or brownish; proximal sheaths and blades with septa few, inconspicuous; blades 13–26 cm × 3–7 mm. Inflorescences terminal, rarely also with 1 lateral inflorescence from distal leaf-axil; rays ascending to divaricate, smooth or weakly scaberulous near nodes, rays without axillary bulblets; bases of involucral-bracts green or speckled with red or black-margined, not glutinous. Spikelets in dense clusters of 2–20 (largest cluster with 10 or more), spikelets sessile, ovoid or narrowly ovoid, 2.5–6 × 1–3 mm; scales black with pale midribs, elliptic to ovate, 1.5–2.7 mm, apex mucronate to short-awned, mucro or awn 0.2–0.4 mm. Flowers: perianth bristles persistent, 6, slender, contorted, much longer than achene and projecting beyond it, with scattered, often inconspicuous, antrorse teeth in distal 1/2, enclosed within scales or some bristles projecting; styles 3-fid. Achenes pale to medium brown, obovate or elliptic in outline, plumply trigonous or planoconvex, 0.9–1.3 × 0.6–0.8 mm.


Phenology: Fruiting summer (Jul–Aug).
Habitat: Moist meadows
Elevation: 600–3000 m

Discussion

Selected References

None.

Lower Taxa

None.

"shortened" is not a number.

... more about "Scirpus congdonii"
pale +  and medium brown +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
papillose +
planoconvex;trigonous;elliptic;obovate +
shorter to much +
0.6mm;0.8mm +
mucronate;short-awned +
Alan T. Whittemore +  and Alfred E. Schuyler +
Britton +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
persistent +
13 cm130 mm <br />0.13 m <br /> (26 cm260 mm <br />0.26 m <br />) +
keeled +, v--shaped +  and flat +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
Barbed (?) +, Toothed (?) +  and Curled (?) +
parallel +  and divergent +
terete +, rolled +  and plicate +
nearly +  and upright +
trigonous +
Calif. +, Nev. +  and Oreg. +
600–3000 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
Moist meadows +
corymbose-paniculate +
speckled with red +  and green +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
cauline +, all +  and basal +
brownish +  and green +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer (Jul–Aug). +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
divaricate +
adventitious +
basal +  and proximal +
elliptic;ovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
cylindric +
not fibrous +
Illustrated +  and Endemic +
0 cm0 mm <br />0 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
50 +  and 500 +
ovoid;ovoid +
1 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Scirpus congdonii +
species +
inconspicuous +
not +  and rhizomatous +