Class
Order
Family
Genus
Classification
Nomenclature
Scientific Name:
Pentapogon lacustris (Edgar & Connor) de Lange & L.M.H.Schmid, Ukr. Bot. J. 79: 75 (2022)
Synonymy:
- ≡ Deyeuxia lacustris Edgar & Connor, New Zealand J. Bot. 37: 68-69 (1999)
Description
Reddish green tufts 18–30 cm, with erect culms topped by dense cylindric panicles and much exceeding the leaves at maturity; branching extravaginal. Leaf-sheath chartaceous, glabrous, light green to light reddish brown, ribs more prominent above. Ligule 2–3 mm, erose, often tapered centrally to a fine tip, abaxially glabrous. Leaf-blade 2–9 cm × 1.5–2 mm, folded, abaxially smooth, adaxially slightly ribbed, sparsely scabrid on ribs; margins finely scabrid, tip hooded. Culm 10–24 cm, erect or geniculate at base, nodes hidden by leaf-sheaths, internodes glabrous. Panicle 1.5–4.5 cm × 5–8 mm, cylindric, dense; rachis smooth, branches and pedicels rather sparsely finely scabrid. Spikelets 5–7 mm, purplish green. Glumes subequal, 1-nerved, submembranous, elliptic-lanceolate, acute, smooth, keel finely scabrid on upper ⅔. Lemma 4–5 mm, ⅔-⅘ length of glumes, subcoriaceous, smooth below, finely papillose to prickle-toothed above, ± elliptic, apex shortly bifid; awn 3.5–4.5 mm, from upper ¼ of lemma, twisted about twice at base, ± recurved above. Palea c. ⅔ length of lemma, hyaline, keels thickened, faintly prickle-toothed above. Callus hairs 0.3–1 mm. Rachilla prolongation 0.5–1 mm, bearing minute hairs throughout except at glabrous tip. Lodicules 0.4–0.5 mm. Anthers 0.3–0.65 mm. Gynoecium: ovary 0.6 mm; stigma-styles 1.0–1.5 mm. Caryopsis c. 2 × 0.6 mm, with dehisced anthers entangled in stigmas. Cleistogamous.
[From: Edgar and Connor (2000) Flora of New Zealand. Volume 5 (second printing) as Deyeuxia lacustris Edgar & Connor.]
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 Deyeuxia lacustris Edgar & Connor] [Nationally Critical]
de Lange, P.J.; Norton, D.A.; Heenan, P.B.; Courtney, S.P.; Molloy, B.P.J.; Ogle, C.C.; Rance, B.D. 2004: Threatened and uncommon plants of New Zealand. New Zealand Journal of Botany 42(1): 45–76. [as Deyeuxia lacustris Edgar & Connor]
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. [as Deyeuxia lacustris Edgar & Connor] [Nationally Critical]
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 Deyeuxia lacustris Edgar & Connor] [Nationally Critical]
Edgar, E.; Connor, H. E. 1999: Species novae graminum Novae-Zelandiae I. New Zealand Journal of Botany 37(1): 63–70.
