Carex rotundata Wahlenb.

Hybrids between Carex rotundata and C. utriculata (= C. ×paludivagans Drury) are known from the Kuskokwim River Valley and Kenai Peninsula of Alaska (W. H. Drury Jr. 1956b; B. A. Ford et al. 1993). Althouth the hybrids can produce hardened achenes, the pollen is sterile. Hybrid plants are intermediate morphologically between the putative parents and possess no unique characters that distinguish them as distinct taxonomic entities (B. A. Ford et al. 1993).

Plants cespitose; rhizomes long. Culms round in cross section, 17–48 cm, smooth distally. Leaves: basal sheaths brown, rarely red tinged; ligules shorter than wide; blades mid to dark green, wiry, filiform-involute, circular in cross section, 1.3–3(–3.2) mm wide, glabrous. Inflorescences 2–14 cm; proximal bract 0.7–10(–16) cm, shorter than or equaling inflorescence; proximal 1–2(–3) spikes pistillate, erect; terminal 1–2(–3) spikes staminate. Pistillate scales ovate, 2.4–4 × 1.3–2.1 mm, as long as or shorter than perigynia, margins entire, apex obtuse or acute, awnless. Perigynia spreading to reflexed, obscurely few-veined, veins not extending to beak, elliptic, 2.5–3.9(–4.2) × 1.4–2.3 mm, apex abruptly contracted, membranaceous; beak 0.4–0.8(–0.9) mm, obscurely bidentulate, smooth, teeth straight, to 0.3 mm. Stigmas 3. Achenes yellow, trigonous, smooth. 2n = 80.

Man., Nfld. and Labr., N.W.T., Que., Yukon; Alaska; Eurasia.

Fruiting Jul–Aug.

Fens, bogs, wet tundra; 0–900m.

Carex melozitnensis A. E. Porsild

Carex rotundata Wahl. Sv. Vet.-Akad. Nya Handl 24: 153. 1803.
"Carex globularis L." Vahl. Skr. Nat.-Selsk. Kjob. 2: 45. 1792.
Carex vesicaria var. inalpina Laest. Nov. Acta Soc. Sci. Upsal. 11 : 288. 1839. (Type from Lapland.)
Onkerma rotundata Raf. Good Book 27. 1840. (Based on Carex rotundata Wahl.)
Carex pulla var. tristigmatica Trautv. Acta Hort. Petrop. 5: 130. 1877. (Type from Siberia.)
Carex rotundata var. Sommieri Christ; Sommier, Nuovo Giorn. Bot. Ital. 25: 95. 1893. (Type from
northern Siberia.) Carex rotundata var. major Meinsh. Acta Hort. Petrop. 18: 376. 1X)1. (Type from Finmark.) Carex rolundata var. laeta Norman, Forh. Vid.-Selsk. Christ. 27" 1 : 52. 1893. (Type from northern
Scandinavia.) Carex roslrala subsp. rolundata " Wahl." Kiikenth. in Engler, Pflanzenreich 4-": 723. 1909. (Based
on C. rotundala Wahl.) Carex roslrala subsp. rotundala f. Sommieri "Christ" Kiikenth. in Engler, Pflan/.enreich 4 20 : 723.
1909. (Based on C. rotundala var. Sommieri Christ.) Carex roslrala subsp. rolundata f. elatior " Lange " Kiikenth. in Engler, Pflanzenreich 4=°: 723. 1909.
(Based on C. rolundata var. elatior Lange.) Carex roslrala subsp. rotundala f. laeta " Norman " Kiikenth. in Engler, Pflanzenreich 4 :o : 723. 1909.
(Based on C. rotundala var. laeta Norman.)
Cespitose, the rootstock short, sending forth long, slender, horizontal stolons, the clumps small, the culms 1.5-4.5 dm. high, slender but stiff, exceeding or sometimes shorter than the leaves, phyllopodic, obtusely angled, smooth, little if at all purplish-red-tinged at base, the lower sheaths not filamentose, the dried-up leaves of the previous year conspicuous; leaves with well-developed blades usually 4—6 to a fertile culm, clustered on the lower third, rather sparingly septate-nodulose, the blades firm, stiff, light-green, involute, usually 7-15 cm. long, 1-3 mm. wide, long-attenuate, smooth or but slightly roughened, the sheaths tight, more or less yellowish-brown-tinged ventrally, truncate at mouth, the ligule very short; staminate spike solitary (or often with 1 or 2 smaller sessile ones at base), usually strongly peduncled, linear, 1-2.5 cm. long, 2-3 mm. wide, the peduncle smooth, the scales oblong-obovate, obtuse, brown with lighter center and white-hyaline margins and apex; pistillate spikes 1 or 2, rather widely separate, ascending, sessile or very nearly so, suborbicular to oblong, 8-25 mm. long, 6-9 mm. wide, containing 20-40 closely packed squarrose perigynia in several to many rows; lowest bract leaflet-like, divergent at right angles, 1-3 cm. long and usually much shorter than the inflorescence, very short-sheathing, the sheath purplish-black at mouth, the second bract much smaller; scales orbicular-ovate to broadly oval, purplish-black with lighter midrib and white-hyaline apex, obtuse or acute, somewhat narrower and shorter than the perigynia; perigynia broadly ovoid or subglobose, 3-3.5 mm. long, 2.25 mm. wide, suborbicular in crosssection, much inflated, membranaceous but firm, glabrous, shining, puncticulate, strawcolored, usually brownish-tinged, obscurely few-nerved, rounded at base and substipitate, very abruptly short-beaked, the beak smooth, 0.75 mm. long, with emarginate or shallowly bidentate orifice; achenes obovoid, 2.25 mm. long, 1.75 mm. wide, triangular with concave sides, loosely enveloped in lower part of perigynium, substipitate, contracted into and continuous with the persistent, slender, twisted or much bent style; stigmas 3, slender, dullwhitish, rather short.
Type locality: "Hab. in paludosis subalpinis Lapponiarum."
Distribution: Wet sunny places, Greenland to northern Alaska; also in extreme northern Eurasia. One of the truly arctic sedges. Erroneously recorded from Maine. (Specimens examined from Greenland, Keewatin, northern Alaska.)

Aapasara (Carex rotundata) on sarakasvien (Cyperaceae) heimoon kuuluva keskikokoinen kasvilaji. Aapasara muistuttaa paljolti kiiltosaraa (Carex saxatilis), mutta lajit ovat erotettavissa lehtien sekä pullakoiden ulkonäön ja emikukkien luottien lukumäärien perusteella.

Aapasaralla on suikertava juurakko, josta varret kasvavat joko yksittäin tai harvalukuisina ryhminä. Varret ovat pyöreähköjä sekä sileitä ja lehtien tyvitupet ovat harmaanruskeita. Lehdet ovat kouruisia, yhteen kiertyneitä sekä kiiltävänvihreitä. Aapasara on erilaistähkäinen saralaji, ja sen kukintona oleva tähkistö koostuu yleensä yhdestä hedetähkästä sekä yhdestä tai kahdesta emitähkästä. Alimman tähkän tukilehti on yleensä pitkä ja kukinnosta poispäin sojottava tai alaspäin kaartunut. Emitähkät ovat yleensä tummanvihreitä sekä lyhyitä ja lieriömäisiä, lähes pallomaisia. Emikukat ovat kolmiluottisia. Tähkäsuomut ovat lähes mustia ja niissä on vaalea keskisuoni. Pullakot ovat emitähkissä tiiviisti ja niiden suuodat sojottavat selvästi tähkistä ulospäin. Muodoltaan pullakot ovat pyöreitä ja laajatyvisiä sekä lyhyen suuodan omaavia.

Aapasara kasvaa märillä soilla sekä muunlaisilla kosteilla, ravinteikkailla ja kalkkipitoisilla kasvupaikoilla tunturialueilla. Suomessa aapasara on yleinen pohjoisessa Lapissa. Erityisesti sitä tavataan Enontekiön, Inarin ja Utsjoen kuntien alueilla, mutta jonkin verran myös hieman etelämpänä.

Carex rotundata adalah spesies tumbuhan seperti rumput yang tergolong ke dalam famili Cyperaceae. Spesies ini juga merupakan bagian dari ordo Poales. Spesies Carex rotundata sendiri merupakan bagian dari genus Carex. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh Wahlenb..

Carex rotundata là một loài thực vật có hoa trong họ Cói. Loài này được Wahlenb. mô tả khoa học đầu tiên năm 1803.