Classification
 Nomenclature
Scientific Name:
Carex obtusifolia (Heenan) K.A.Ford in Global Carex Group, Bot. J. Linn. Soc. 179: 34 (2015)
Synonymy:
  • Uncinia obtusifolia Heenan, New Zealand J. Bot. 34: 11-14 (1996)
 Description

Small tufts to small tussocks, laxly to densely caespitose, sometimes with fine creeping rhizomes. Culms glabrous, trigonous, at flowering similar in length to leaves, at maturity much longer than leaves, (50-)100-250(-400) × 0.3-0.4(-0.6) mm; basal bracts light brown to yellow- brown, dull, 2—7 mm long. Leaves plano-convex or concavo-convex, rigid, linear, strongly nerved on abaxial surface, erect or ascending, (45—)60— 220(—300) × 0.4—0.5 mm; apex obtuse and nerves weak or absent; margins scabrous when young, often becoming glabrous when mature. Spikes oblong, 15-20 mm long; female flowers proximal, 3—7, internodes 1.5—3 mm long; male flowers distal, 3— 5. Glumes < utricle, deciduous, elliptic-lanceolate to lanceolate, 3.5-4.5(-5) × 1.5-2 mm; midrib green; apex subacute to obtuse; margins membranous. Utricles trigonous, elliptic to lanceolate, yellowgreen, yellow-brown, or light brown, lateral nerves present but not conspicuous, 5—6.2 × 0.9—1.1 mm; stipe and beak both narrow, each c. 1.5 mm long; rachilla exserted beyond utricle, 5.3—6.5 mm long. Nut trigonous, narrow-elliptic to linear, pale brown, dull, (3-)3.2-3.9 × 0.8-1.1 mm. FL Nov-Dec, FT Dec-May.

[Reproduced from Heenan (1996, New Zealand J. Bot. 34: 11–15) with permission from The Royal Society of New Zealand. as Uncinia obtusifolia Heenan]

 Biostatus
Indigenous (Endemic)
 Bibliography
de Lange, P.J.; Norton, D.A.; Courtney, S.P.; Heenan, P.B.; Barkla, J.W.; Cameron, E.K.; Hitchmough, R.; Townsend, A.J. 2009: Threatened and uncommon plants of New Zealand (2008 revision). New Zealand Journal of Botany 47: 61–96. [as Uncinia obtusifolia Heenan] [Naturally uncommon]
de Lange, P.J.; Rolfe, J.R.; Barkla J.W.; Courtney, S.P.; Champion, P.D.; Perrie, L.R.; Beadel, S.N.; Ford, K.A.; Breitwieser, I.; Schönberger, I.; Hindmarsh-Walls, R.; Heenan, P.B.; Ladley, K. 2018: Conservation status of New Zealand indigenous vascular plants, 2017. New Zealand Threat Classification Series No. 22. [Naturally Uncommon]
de Lange, P.J.; Rolfe, J.R.; Champion, P.D.; Courtney, S.P.; Heenan, P.B.; Barkla, J.W.; Cameron, E.K.; Norton, D.A.; Hitchmough, R.A. 2013: Conservation status of New Zealand indigenous vascular plants, 2012. New Zealand Threat Classification Series 3. Department of Conservation, Wellington. [as Uncinia obtusifolia Heenan] [Naturally Uncommon]
Global Carex Group 2015: Making Carex monophyletic (Cyperaceae, tribe Cariceae): a new broader circumscription. Botanical Journal of the Linnean Society 179: 1–42.
Heenan, P.B. 1996: Uncinia obtusifolia (Cyperaceae), a new species of hooked sedge in New Zealand. New Zealand Journal of Botany 34: 11–15.
Lehnebach, C.A. 2011: Re-evaluating species limits in Uncinia angustifolia, U. caespitosa s.str., U. rupestris, U. viridis and U. zotovii (Cyperaceae). Australian Systematic Botany 24: 405–420.