Class
Order
Family
Genus
Classification
Nomenclature
Scientific Name:
Pentapogon lautumia (Edgar & Connor) P.M. Peterson, Romasch. & Soreng in Peterson et al., J. Syst. Evol. 60: 18 (online) (2022)
Synonymy:
- ≡ Dichelachne lautumia Edgar & Connor (1999)
Description
Robust grey-green tufts, 45–65 cm; branching extravaginal. Leaf-sheath chartaceous with membranous margins, ± distinctly ribbed, glabrous, stramineous, or reddish purple, especially in culm leaves. Ligule 0.7–1.0 mm, truncate, erose, sparsely ciliate, abaxially scabrid. Leaf-blade 6–20 cm × 1.5–3.0 mm, greyish green to later reddish, abaxially smooth, adaxially strongly ribbed, prickle-toothed on ribs; margins finely prickle-toothed. Culm 30–45 cm, nodes green to purple with an upper fringe of dense appressed hairs, internodes glabrous. Panicle 10–16 × 1–1.5 cm, linear-lanceolate, dense, contracted above, longer lower branches in slightly more distant clusters, scarcely spreading, spikelet-bearing to base; rachis, branches, and pedicels with short hair-like prickle-teeth. Spikelets 6–8 mm, green to stramineous or purple-suffused. Glumes 1-nerved, equal or upper very slightly longer, c. 6 mm, submembranous, elliptic-lanceolate, acuminate, keels finely prickle-toothed. Lemma ≤ glumes, 6–7 mm, subcoriaceous, papillose, minutely prickle-toothed above, apex bifid with hyaline finely acuminate lobes 0.5–1 mm; awn 8–12 mm, middorsal, or from slightly above midway, geniculate, twisted, very hairy below. Palea < lemma, folded, keels prickle-toothed above, apex ciliate. Callus c. 0.2 mm, hairs to 4 mm. Rachilla 0.2–0.7 mm, glabrous or with a few hairs; prolongation 0.5 mm. Lodicules c. 0.5 mm, cuneate, ciliate. Stamens 3; anthers 1.0–1.5 mm. Gynoecium: ovary 1–1.3 mm; stigma-styles 0.7–1.5 mm, hairs almost to base. Caryopsis c. 3.5 × 1 mm, beaked; embryo 0.5 mm; hilum 2.0 mm. 2n= 70 (+ 2f).
[From: Edgar and Connor (2000) Flora of New Zealand. Volume 5 (second printing). as Dichelachne lautumia 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 Dichelachne lautumia 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 Dichelachne lautumia 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 Dichelachne lautumia Edgar & Connor] [Nationally Endangered]
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 Dichelachne lautumia 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. [as Dichelachne lautumia Edgar & Connor]
Peterson, P.M.; Soreng, R.J.; Romaschenko, K.; Barberá, P.; Quintanar, A.; Aedo, C.; Saarela, J.M. 2022: Phylogeny and biogeography of Calamagrostis (Poaceae: Pooideae: Poeae: Agrostidinae), description of a new genus, Condilorachia (Calothecinae), and expansion of Greeneochloa and Pentapogon (Echinopogoninae). Journal of Systematics and Evolution 60(3): 570–590. (Published online: May 2022)
