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The grass genera of the world

L. Watson, T.D. Macfarlane, and M.J. Dallwitz

Saxipoa Soreng, L.J. Gillespie & S.W.L. Jacobs

~ Poa saxicola R. Br.

Type species: S. saxicola (R.Br.) Soreng, L.J., Gillespie & S.W.L. Jacobs.

Habit, vegetative morphology. Perennial; erect caespitose. Culms 13–105 cm high; herbaceous; unbranched above; 1–2 noded. Culm nodes glabrous. Culm internodes hollow. Young shoots intravaginal, or extravaginal and intravaginal. The shoots not aromatic. Leaves mostly basal; non-auriculate. Sheath margins joined basally 0–3% of their length. Leaf blades linear; shallowly naviculate or apically cucullate; narrow; 4–18 cm long, 3–5 mm wide; shallowly keeled, apically naviculate, flat, or folded; without cross venation. Ligule an unfringed membrane (ciliolate, abaxially hairy, lacerate or not); 0.9–4.5 mm long.

Reproductive organization. Plants bisexual, all with bisexual spikelets; with hermaphrodite florets. The spikelets hermaphrodite; homomorphic.

Inflorescence. Inflorescence exserted. paniculate; contracted; symmetrical, more or less ovoid to spicate (linear-oblong, 10–18 cm long). Primary inflorescence branches inserted all around the main axis (spiralled). Rachides flattened, or neither flattened nor hollowed, not winged (straplike or subterete). Spikelets solitary; not secund; pedicellate.

Female-fertile spikelets. Spikelets 4.5–6.8 mm long; broadly elliptic; turgid, slightly compressed laterally; disarticulating above the glumes; disarticulating between the florets. Rachilla prolonged beyond the uppermost female-fertile floret; the rachilla extension with incomplete florets, or naked. Hairy callus present (sometimes with a few straight hairs ventrally), or absent. Callus 0.27–0.33 mm long; blunt.

Glumes two; more or less equal; shorter than the spikelets; somewhat shorter than the adjacent lemmas; hairy to hairless (the margins ciliate below); pointed; acute, muticous awnless; carinate; narrowly ovate to elliptic, membranous to chartaceous, similar. Lower glume slightly shorter than the lowest lemma; 3 nerved, or 5 nerved. Upper glume 3 nerved, or 5 nerved. Spikelets with incomplete florets. The incomplete florets distal to the female-fertile florets. The distal incomplete florets merely underdeveloped; awnless.

Female-fertile florets 2–4. Lemmas ovate; membranous to chartaceous, similar in texture to the glumes to decidedly firmer than the glumes; not becoming indurated; entire; pointed to blunt; awnless to mucronate, or awned (the keel vein sometimes with a very short, straight awn or mucro not exceeding the lemma tip). Awns if so interpreted, 1; median; dorsal; from near the top; non-geniculate; much shorter than the body of the lemma; entered by one vein. Lemmas hairy (towards the apex of the mid-vein), or hairless; carinate; without a germination flap; 5 nerved, or 7 nerved; with the nerves non-confluent. Palea present; relatively long (slightly shorter than the lemma); tightly clasped by the lemma; acute to truncate, entire; awnless, without apical setae; textured like the lemma; not indurated; 2-nerved; longitudinally infolded or 2-keeled. Palea back glabrous to scabrous (or puberulous). Lodicules present; 2; free; membranous; ciliate to glabrous (with or without a few apical cilia); toothed to not toothed; not or scarcely vascularized. Stamens 3. Anthers 1–1.5 mm long; not penicillate; without an apically prolonged connective. Ovary obovoid, apically glabrous (or with no more than a few apical cilia); without a conspicuous apical appendage. Styles 2, free to their bases; free. Stigmas 2; densely plumose, without secondary branching, white.

Fruit, embryo and seedling. Fruit free from both lemma and palea; small (2.1–2.6 mm long); fusiform, or ellipsoid; ventrally longitudinally grooved; compressed laterally, or compressed dorsiventrally (or ventrally); glabrous. Hilum short. Embryo large; not waisted. Endosperm hard. Embryo with an epiblast.

Classification. Watson & Dallwitz (1994): not described separately. Soreng et al. (2015): Pooideae; Poodae; Poeae; Poinae. 1 species (S. saxicola).

Distribution, phytogeography, ecology. Southeastern Australia, Tasmania.

References, etc. Morphological/taxonomic: Vickery (1970), Weiller et al. (1995).

Illustrations. • P. tenera and S. saxicola (as Poa): Hooker, Fl. Tasmaniae (1860)


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Cite this publication as: ‘Watson, L., Macfarlane, T.D., and Dallwitz, M.J. 1992 onwards. The grass genera of the world: descriptions, illustrations, identification, and information retrieval; including synonyms, morphology, anatomy, physiology, phytochemistry, cytology, classification, pathogens, world and local distribution, and references. Version: 13th November 2017. delta-intkey.com/grass’.

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