Piptochaetium

Belongs within: Pooideae.

Piptochaetium is an American genus of grasses with inrolled margins on the lemma fitting into the grooved palea (Hickman 1993).

Characters (Hickman 1993): Perennial, cespitose. Stem prostrate or erect. Leaves generally basal; blade generally inrolled, with translucent line on both sides of midvein, generally wavy toward tip. Inflorescence panicle-like; spikelets generally only on distal half of branches. Spikelet with glumes more or less equal, generally longer than floret; axis breaking above glumes; floret 1, generally ovoid; lemma finely striate, hairs brown, tubercled near neck-like tip, margins inrolled, fitting into grooved palea, awned; palea slightly longer than lemma, grooved longitudinally.

<==Piptochaetium
    |--P. lasianthumS06
    |--P. leiocarpum (Speg.) Hackel in Stuckert 1906 [=Oryzopsis lejocarpa; incl. P. panicoides]S06
    |    |--P. l. f. leiocarpumS06
    |    `--P. l. f. subpapillosa Hackel in Stuckert 1906S06
    |--P. napostaense [=Oryzopsis napostaensis; incl. Stipa capillifolia]S06
    |--P. ovatumS06
    |    |--P. o. var. ovatumS06
    |    `--P. o. var. chaetophorumS06
    |--P. palustreLBM08
    |--P. ruprechtianum Desv. 1853S06
    |--P. setosumH93
    `--P. tuberculatum [=Oryzopsis tuberculata]S06

*Type species of generic name indicated

References

[H93] Hickman, J. C. (ed.) 1993. The Jepson Manual: Higher Plants of California. University of California Press: Berkeley (California).

[LBM08] Lüdtke, R., I. I. Boldrini & S. T. S. Miotto. 2008. Polygala altomontana (Polygalaceae), a new species from southern Brazil. Kew Bulletin 63 (4): 665–667.

[S06] Stuckert, T. 1906. Segunda contribución al conocimiento de las gramináceas Argentinas. Anales del Museo Nacional de Buenos Aires, serie 3, 6: 409–555.