McCoy, Elizabeth (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume LXII (1974)
Marcks, Brian G.
Preliminary reports on the flora of Wisconsin No. 66. Cyperaceae II- sedge family II. The genus Cyperus- the umbrella sedges, pp. 261-284 PDF (8.4 MB)
1974] Marcks—Sedge Family II Report 269 tuber. Culms 2—9 dm high, acutely 3-angled, smooth and subcoriaceous at base, soft and scabrous at the apex; involucral bracts blade-like, 2—9, exceeding the umbel, spreading. Inflorescence an open and often compound umbel of several subsessile spikes, with several additional ascending pedunculate rays 1—10 dm long. Spikelets mostly 4-ranked along an elongate rachis 1—3 cm long, loosely aggregated and spreading nearly horizontally, barely flattened, 5—25 mm long, 5-28-flowered; rachilla persistent, narrowly winged. Scales overlapping, 2—3 mm long, yellowish-brown to golden brown. Stamens 3, 1.2—1.5 mm long. Achene trigonous, ellipsoid to obovoid, rounded at the summit, 1.2—1.6 mm long (sometimes female sterile), lustrous tan to golden brown. A widely distributed pantropical and warm ' temperate weed, sparingly throughout Wisconsin in wet sand or mud of lakeshores and riverbanks, and as a weed in low fields and roadsides. Flowering from July to October; fruiting from mid-July to mid-October (2n = 108; Hicks, 1929; Darlington and Wylie, 1955). 7. CYPERUS ODORATUS L. Map 7. Coarse Cyperus C. ferruginescens Böeckl. C. speciosus var. squarrosus Britt. C. speciosus var. ferruginescens (Böeckl.) Britt. C. ferax ssp. speciosus (Britt.) KUkenth. C. odorcttus var. squarrosus (Britt.) Gilly Fibrous-rooted annuals 2—60 cm tall, erect or dwarfed, spreading from loose tufts. Culms several, smooth, firm, acutely 3-angled. Blades flat, apically scabrous; involucral bracts blade-like, 3—6, spreading, sometimes greatly exceeding the umbel. Inflorescence a compound umbel (or condensed into a loose head-like cluster), with several loose subsessile spikes and up to 7 unequal divergent pedunculate rays 1—6 cm long. Spikelets closely aggregated along a ± elongate rachis 5—20 mm long, mostly spreading horizontally or slightly ascending, slender and subterete, 4-20-flowered, 4—26 mm long; rachilla breaking into 1-fruited sections at maturity, winged. Scale with apex overlapping sup-erjacent scale, 1.5—2.0 mm long, the keel green; laminae reddish-brown. Stamens 3, O.3-~0.5 mm long. Achene trigonous-oblongoid, 1—1.5 mm long, ferru-ginous to golden brown. The entity from the interior of temperate North America, formerly treated as C. ferruginescens BOeckeler but inseparable from the semi-cosmopolitan tropical and subtropical C. odoratus (O'Neill, 1942), is of infrequent occurrence in Wisconsin south of
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