Stenotalis B.G.Briggs & L.A.S.Johnson

Scientific Description

Family Restionaceae.

Habit and leaf form. Herbs (with ascending rhizomes, base pubescent); evergreen. Switch-plants; with the principal photosynthesizing function transferred to stems (culms). Leaves well developed, or much reduced (the blade being much reduced or absent). Perennial. Young stems striate; not breaking easily at the nodes. Stem internodes solid, or hollow. Rhizomatous. Helophytic. Leaves alternate; distichous, or spiral; leathery, or membranous; sessile; sheathing (and more or less reduced to the sheaths). Leaf sheaths with free margins (persistent, appressed). Leaves simple; with a persistent basal meristem, and basipetal development. Vegetative anatomy. Plants with silica bodies. Leaf anatomy. Leaf blade epidermis conspicuously differentiated into ‘long’ and ‘short’ cells, or without differentiation into ‘long’ and ‘short’ cells. Guard-cells not ‘grass type’, or ‘grass type’. Stem anatomy. Secondary thickening absent.

Reproductive type, pollination. Fertile flowers functionally male, or functionally female. Unisexual flowers present. Plants dioecious. Female flowers with staminodes, or without staminodes. Male flowers with pistillodes, or without pistillodes. Floral nectaries absent (nectaries absent). Anemophilous.

Inflorescence and flower features. Flowers aggregated in ‘inflorescences’; in ‘spikelets’. Inflorescences scapiflorous, or not scapiflorous; terminal; male and female inflorescences very different. Flowers bracteate; bracteolate, or ebracteolate; cyclic. Perigone tube absent. Perianth of ‘tepals’; members 5, or 6; 2 -whorled; isomerous, or anisomerous; sepaloid. Fertile stamens present, or absent (when female). Androecium (2–)3. Androecial members free of the perianth; free of one another; 1 -whorled. Androecium exclusively of fertile stamens. Stamens (2–)3; remaining included; oppositiperianthial (opposite the inner perianth members). Anthers dorsifixed; versatile, or non-versatile; dehiscing via longitudinal slits; introrse, or latrorse; bisporangiate, or tetrasporangiate; appendaged, or unappendaged. Pollen shed as single grains. Fertile gynoecium present, or absent (male flowers). Gynoecium 3 carpelled. The pistil 1 celled. Carpels isomerous with the perianth, or reduced in number relative to the perianth. Gynoecium syncarpous; synstylovarious; superior. Ovary unilocular; 1 locular; sessile to stipitate. Gynoecium stylate. Styles 3; partially joined. Ovules in the single cavity 1; funicled, or sessile; pendulous; non-arillate; orthotropous.

Fruit and seed features. Fruit non-fleshy; indehiscent; a nut (small, shed with enclosing glume and persistent perianth); 1 seeded. Seeds ellipsoid; copiously endospermic. Embryo weakly differentiated. Testa smooth. Seedling. Hypocotyl internode absent. Mesocotyl absent. Seedling collar not conspicuous. Cotyledon hyperphyll elongated; assimilatory; more or less circular in t.s. Coleoptile absent. Seedling cataphylls absent. First leaf centric. Primary root ephemeral.

Additional characters Perianth of male flowers of ‘tepals’; 5. Perianth of female flowers of ‘tepals’; 6. Stems pubescent (with appressed ‘fan-hairs’); much branched. Male spikelets several-flowered to many-flowered (spikelets usually numerous, pendulous). Female spikelets 1-flowered to 2-flowered (‘spikelets’ very narrow). Caespitose. Female spikelets compound (with small bracts between the flower and subtending glume) (with 1 bract on the flower stalk). Male flowers without a swollen base. Pericarp thin-textured.