Class
Genus
Classification
Nomenclature
Scientific Name:
Althenia bilocularis (Kirk) Cockayne in Speight et al., Value cannot be null.
Parameter name: s 126 (1927)
Synonymy:
- ≡ Lepilaena bilocularis Kirk (1896)
Description
Submerged summer-green herb. Rhizome to 1 mm. diam., internodes 1–2 cm. long. Stems occ. branched, to 20 cm. long, filiform; internodes c. 1–4 cm. long. Lvs regularly alt.; lf-base at first sheathing stem, to 4 mm. long, fibrous in age; lamina c. 2.5–3.5 cm. × 1 mm., 1-(or 3-) nerved, entire, tip squarely truncate, nerve (or nerves) shortly excurrent. Fl. enclosed within lf-bases. ♂ on pedicel that elongates to 5 mm.; per.-segs mucronate, enclosing only extreme base of anther; stamen solitary; anther 2 × 0.6 mm., sessile, curved; pollen sacs 2, connective excurrent in short, sharp mucro. ♀ shortly pedicellate; per.-segs narrow-oblong, ± laciniate, c. 1.5 × 0.5 mm.; carpels us. 3, occ. 4, shortly stipitate; style narrower than ovary, stigma obliquely funnel-shaped with long-fimbriate margins. Achene c. 1.5–2 × 0.5 mm., asymmetrically oblong, yellow, smooth, narrowing above to style-remnant c. 1 mm. long. 2n = 12.
[From: Moore and Edgar (1970) Flora of New Zealand. Volume 2. as Lepilaena bilocularis Kirk]
Biostatus
Indigenous (Non-endemic)
Phenology
Flowering: Nov.–May.; Fruiting: Dec.–May.
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 Lepilaena bilocularis Kirk] [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 Lepilaena bilocularis Kirk]
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 Lepilaena bilocularis Kirk] [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. [as Lepilaena bilocularis Kirk] [Nationally Vulnerable]
Ito, Y.; Tanaka, N.; García-Murillo, P.; Muasya, A.M. 2016: A new delimitation of the Afro-Eurasian plant genus Althenia to include its Australasian relative, Lepilaena (Potamogetonaceae)–evidence from DNA and morphological data. Molecular Phylogenetics and Evolution 98: 261–270.
Speight, R.; Wall, A.; Laing, R.M. (ed.) 1927: Natural History of Canterbury: a series of articles on the early history of the province and on the history of scientific investigation, up till 1926, as well as on some results of this investigation . Philosophical Institute of Canterbury, Christchurch.
