Stipeae

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Stipeae
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Poaceae
Tribe: Stipeae

The Stipeae are a tribe of grasses within the subfamily Pooidae, with up to 600 described species.[1]

Description[edit]

The defining morphological features of the Stipeae include single-flowered spikelets lacking a rachilla extension, and the lemmas (the external bract) have either a sharp point or a terminal awn (long bristle).[2]

Genera[edit]

The tribe includes the genera:

Many species were initially placed into Stipa but have now been split off into new genera. Some recent papers have analysed relationships within and between genera[3][4][5] although a complete analysis has not yet been completed. Stipoid grasses use the C3 (cool season) photosynthetic pathway and live in temperate areas worldwide.[6]

Known fossils date from the late Miocene.[7]

References[edit]

  1. ^ Barkworth ME, Arriaga MO, Smith JF, Jacobs SWL, Valdes-Reyna J, Bushman BS (2008) Molecules and Morphology in South American Stipeae (Poaceae). Systematic Botany 33(4), 719-731.
  2. ^ Cialdella AM, Giussani LM, Aagesen L, Zuloaga FO, Morrone O (2007) A phylogeny of Piptochaetium (Poaceae : Pooideae : Stipeae) and related genera based on a combined analysis including trnL-F, rp116, and morphology. Systematic Botany 32(3), 545-559.
  3. ^ Barber JC, Hames KA, Cialdella AM, Giussani LM, Morrone O (2009) Phylogenetic relationships of Piptochaetium Presl (Poaceae: Stipeae) and related genera reconstructed from nuclear and chloroplast sequence datasets. Taxon 58(2), 375-380.
  4. ^ Jacobs SWL, Bayer R, Everett J, Arriaga MO, Barkworth ME, Sabin-Badereau A, Torres MA, Vazquez FM, Bagnall N (2007) Systematics of the tribe Stipeae (Gramineae) using molecular data. Aliso 23, 349-361.
  5. ^ Jacobs SWL, Everett J, Barkworth ME, Hsiao C (2000) Relationships within the Stipoid grasses (Gramineae). In 'Grass Systematics and Evolution.' (Eds SWL Jacobs and J Everett) pp. 75-82. (CSIRO: Melbourne)
  6. ^ Romaschenko K, Peterson PM, Soreng RJ, Garcia-Jacas N, Futorna O, Susanna A (2008) Molecular phylogenetic analysis of the American Stipeae (Poaceae) resolves Jarava sensu lato polyphyletic: evidence for a new genus, Pappostipa. Journal of the Botanical Research Institute of Texas 2(1), 165-192.
  7. ^ Thomasson JR (2005) Berriochloa gabeli and Berriochloa huletti (Gramineae: Stipeae), two new grass species from the late Miocene Ash Hollow Formation of Nebraska and Kansas. J Paleontol 79 (1):185-199

External links[edit]