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8. ARISTIDOIDEAE Caro

Mary E. Barkworth Utah State University Press ePub

The subfamily Aristidoideae includes one tribe, the Aristideae.

Pl ann or per; usu csp. Clm ann, erect, solid or hollow, usu unbrchd. Lvs distichous; shth usu open; aur absent; abx lig absent or of hairs; adx lig memb and ciliate or of hairs; bld without psdpet; mesophyll cells radiate or non-radiate; adx palisade layer absent; fusoid cells absent; arm cells absent; Kranz anatomy absent or present, when present, with 1 or 2 parenchyma shth; midribs simple; adx bulliform cells present; stomatal subsidiary cells dome-shaped or triangular; bicellular microhairs present, with long, slender, thin-walled tml cells. Infl tml, not lfy, usu pan, smt spikes or rcm. Spklt bisx, with 1 flt; rchl extension absent; dis above the glm. Glm 2, usu longer than the flt, usu acute or acuminate; flt terete or lat compressed, with well-developed cal; lm 1- or 3-veined, more or less coriaceous, with a germination flap, lm mrg overlapping at maturity and concealing the pal, apc evidently 3-awned; awn bases often forming a column, lat awns occ rdcd or absent; pal less than ½ as long as the lm; lod usu present, 2, free, memb, glab, heavily vascularized; anth 1–3; ov glab; haustorial synergids absent; sty 2, free to the base but close. Car usu fusiform, falling with the lm and pal attached; hila short or long, linear; endosperm hard, without lipid; stch g compound; emb small or large relative to the car; epiblasts absent; scutellar cleft present or absent; mesocotyl intnd elongated; embryonic lf mrg meeting.

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3. EHRHARTOIDEAE Link

Mary E. Barkworth Utah State University Press ePub

The Ehrhartoideae encompasses three tribes, one of which, the Oryzeae, is native to the Manual region; the Ehrharteae is represented by introduced species. The third tribe, Phyllorachideae C.E. Hubb., is native to Africa and Madagascar. There are approximately 120 species in the Ehrhartoideae. They grow in forests, open hillsides, and aquatic habitats.

Molecular data provide strong support for the close relationship of the Oryzeae and Ehrharteae. Morphologically, they are characterized by spikelets that have a distal unisexual or bisexual floret with up to two proximal sterile florets and, frequently, six stamens in the staminate or bisexual florets.

1. Spikelets with 2 sterile florets below the functional floret, both well-developed, at least the upper sterile floret as long as or longer than the functional floret; glumes from ½ as long as the spikelets to exceeding the florets; culms not aerenchymatous; plants of dry to damp habitats . . . . . . . . . . . . . . . . . . . . . . . 4. Ehrharteae

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10. PANICOIDEAE Link

Mary E. Barkworth Utah State University Press ePub
Medium 9780874216868

7. DANTHONIOIDEAE N.P. Barker & H.P. Linder

Mary E. Barkworth Utah State University Press ePub
Medium 9780874216868

4. POÖIDEAE Benth.

Mary E. Barkworth Utah State University Press ePub

The subfamily Poöideae includes approximately 3300 species, making it the largest subfamily in the Poaceae. It reaches its greatest diversity in cool temperate and boreal regions, extending across the tropics only in high mountains.

1. Inflorescences 1-sided spikes, the spikelets radial to and partially embedded in the rachises; spikelets with 1 floret each . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. Nardeae

1. Inflorescences panicles, racemes, or 2-sided spikes with spikelets radial or tangential to the rachises, sometimes embedded in the axes, never both radial and embedded; spikelets with 1–30 florets.

2. Cauline leaf sheaths closed for at least ¾ their length; lemmas longer than (4.5)6.5 mm or awned or with prominent, parallel veins.

3. Ovary apices glabrous; styles fused at the base, divergent, naked on the lower portion, plumose distally; lemmas often with a purplish band in the distal ½, usually unawned; distal 1–3 florets often reduced to lemmas, the lower 1–2 lemmas often enclosing the terminal lemmas; lodicules about 0.2–0.5 mm long, truncate, fleshy, without a distal membranous portion . . . . . . . . . . . . . . . . . . . . . 9. Meliceae

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