Class
Order
Family
Genus
Classification
Nomenclature
Scientific Name:
Pentapogon youngii (Hook.f.) de Lange & L.M.H.Schmid, Ukr. Bot. J. 79: 73 (2022)
Synonymy:
- ≡ Agrostis youngii Hook.f., Handb. New Zealand Fl. 330 (1864)
- ≡ Deyeuxia youngii (Hook.f.) Buchanan, Indig. Grasses N. Zeal. add et corrig. 11 (1880)
- ≡ Calamagrostis youngii (Hook.f.) Petrie, Trans. & Proc. New Zealand Inst. 47: 57 (1915)
- = Calamagrostis petriei Hack., Trans. New Zealand Inst. 35: 380 (1903)
- ≡ Deyeuxia petriei (Hack.) Cheeseman, Man. New Zealand Fl. 872 (1906)
- ≡ Calamagrostis youngii var. petriei (Hack.) Petrie, Trans. & Proc. New Zealand Inst. 47: 57 (1915)
- ≡ Deyeuxia youngii var. petrie (Hack.) Cheeseman, Man. New Zealand Fl., ed. 2, 162 (1925)
Description
Tufts rather narrow, 30–130 cm; branching extravaginal. Leaf-sheath chartaceous with membranous margins, distinctly ribbed, glabrous or finely hairy, light green to light brown. Ligule 0.8–2.5 mm, truncate, ciliate to lacerate, abaxially smooth, or densely minutely pubescent-scabrid. Leaf-blade 12–35–(60) cm × 1–4 mm, stiff, flat to frequently rolled, especially towards tip, abaxially smooth, adaxially distinctly ribbed and finely scabrid on ribs; margins finely scabrid, tip filiform, acute. Culm 40–115 cm, nodes conspicuous, internodes mostly smooth, but sparsely scabrid below panicle. Panicle 7–16–(22) cm × 5–23 mm, linear-lanceolate, shortly and narrowly branched, or more open below; rachis smooth, branches slightly scabrid, with ± densely crowded spikelets on slightly scabrid pedicels. Spikelets 4.5–7.5 mm, light green or purplish. Glumes 1-nerved, submembranous, elliptic-lanceolate, acute, scabrid near apex, keel scabrid. Lemma (4)–5–6 mm, ⊬ glumes, subcoriaceous, scabrid, elliptic-lanceolate, apex denticulate; awn (0.5)–1–3 mm, straight, from upper ⅓ of lemma or rarely middorsal, usually barely reaching but occasionally overtopping lemma apex, rarely awn 0. Palea ˜ lemma, keels and interkeel scabrid. Callus hairs fine, ± dense, c. ½ length of lemma. Rachilla prolongation 1.5–2.5 mm, tipped by dense tuft of fine hairs 2–3–(3.5) mm, almost reaching lemma apex. Lodicules 0.6–0.8 mm, linear, acute. Anthers 1.2–1.9 mm, penicillate. Caryopsis 2.5–3 × 0.7–1 mm.
[From: Edgar and Connor (2000) Flora of New Zealand. Volume 5 (second printing). as Deyeuxia youngii (Hook.f.) Buchanan]
Biostatus
Indigenous (Endemic)
Bibliography
Buchanan, J. 1880: The Indigenous Grasses of New Zealand (with Addenda et Corrigenda). George Didsbury, Government Printer, Wellington.
Cheeseman, T.F. 1906: Manual of the New Zealand Flora. Government Printer, Wellington.
Cheeseman, T.F. 1925: Manual of the New Zealand Flora. Edition 2. Government Printer, Wellington.
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 youngii (Hook.f.) Buchanan] [Naturally uncommon]
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 youngii (Hook.f.) Buchanan]
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 youngii (Hook.f.) Buchanan] [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 Deyeuxia youngii (Hook.f.) Buchanan] [Naturally Uncommon]
Edgar, E. 1995: New Zealand species of Deyeuxia P.Beauv. and Lachnagrostis Trin. (Graminieae: Aveneae)*. New Zealand Journal of Botany 33: 1–33. [as Agrostis youngii Hook.f.; Calamagrostis petriei Hack.; Calamagrostis youngii (Hook.f.) Petrie; Calamagrostis youngii var. petriei (Hack.) Petrie; Deyeuxia petriei (Hack.) Cheeseman; Deyeuxia youngii (Hook.f.) Buchanan; Deyeuxia youngii var. petrie (Hack.) Cheeseman]
Häckel, E. 1903: On New Species of Grasses from New Zealand. Transactions of the New Zealand Institute 35: 377–385.
Hooker, J.D. 1864: Handbook of the New Zealand Flora: a systematic description of the native plants of New Zealand and the Chatham, Kermadec's, Lord Auckland's, Campbell's and Macquarie's Islands. Part I. Reeve, London.
Petrie, D. 1915: Descriptions of New Native Phanerogams, with other Short Notices. Transactions and Proceedings of the New Zealand Institute 47: 48–59.
