Class
Order
Family
Genus
Classification
Nomenclature
Scientific Name:
Amphibromus fluitans Kirk (1884)
Description
Weak tufts, (7)–20–40 cm, stoloniferous, with decumbent culms rooting at lower nodes, erect or floating above; branching extravaginal. Leaf-sheath chartaceous, smooth, or scabrid, especially towards ligule, uppermost sheaths often scabrid throughout. Ligule 1.5–4.5–(5) mm, long-tapered, acute, entire, becoming lacerate, abaxially smooth or sparsely, minutely scabrid. Leaf-blade 5.5–12.5 cm × (0.6)–1–3 mm, flat, or inrolled, papillose-scabrid, abaxially shallowly ribbed, adaxially more obviously ribbed; margins minutely scabrid, tip acute. Culm internodes smooth, sometimes scabrid just below nodes. Panicle 6.5–13 cm, ± erect, enclosed below by uppermost leaf-sheath; branches and pedicels filiform, scabrid. Spikelets 15–25 mm, 3–6-flowered, pale green; florets chasmogamous and cleistogamous within the same spikelet. Glumes unequal, glabrous, obtuse, margins ciliate-scabrid; lower 2–3.3 mm, 1-nerved, narrow-lanceolate, upper (2.2)–3.5–4 mm, 3-nerved, ± ovate-lanceolate. Lemma (4)–4.5–5.5 mm, 7-nerved, firm, green central portion sparsely scabrid, smooth near base, hyaline margin very wide, finely minutely hairy or scabrid; lemma lobes 2, obtuse; awn 7.5–18 mm, stout, straight, arising from near midpoint of lemma. Palea < lemma, keels densely stiff-ciliate, interkeel glabrous. Callus with ring of fine hairs < 1 mm. Rachilla prolongation 1.5–1.8 mm, hairy above. Anthers in chasmogamous florets 1.4–1.7 mm; in cleistogamous florets 0.4–0.5–(0.8) mm. Caryopsis 1.5–2 × 0.5–0.7 mm.
[From: Edgar and Connor (2000) Flora of New Zealand. Volume 5 (second printing).]
Biostatus
Indigenous (Non-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. [Nationally Endangered]
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.
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. [Nationally Vulnerable]
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. [Nationally Vulnerable]
