Stipeae Explained

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

Description

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

The tribe includes 28 genera:^[3]

Many species initially placed into Stipa have now been split off into new genera. Some recent papers have analysed relationships within and between the genera,^{[4] [5] [6]} but a complete analysis has not yet been performed. Stipoid grasses use the C₃ photosynthetic pathway and live in temperate areas worldwide.^[7]

Known fossils date from the late Miocene.^[8]

External links

• Stipa L. sensu lato (sensu lato refers to the tribe) The grass genera of the world website by L. Watson, T.D. Macfarlane, and M.J. Dallwitz

Notes and References

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. Soreng. Robert J.. Peterson. Paul M.. Romaschenko. Konstantin. Davidse. Gerrit. Teisher. Jordan K.. Clark. Lynn G.. Barberá. Patricia. Gillespie. Lynn J.. Zuloaga. Fernando O.. A worldwide phylogenetic classification of the Poaceae (Gramineae) II: An update and a comparison of two 2015 classifications. Journal of Systematics and Evolution. 55. 4. 2017. 259–290. 1674-4918. 10.1111/jse.12262. free. 10261/240149. free.
4. Barber. Janet C.. Hames. Kasey A.. Cialdella. Ana Maria. Giussani. Liliana M.. Morrone. Osvaldo. Phylogenetic relationships of Piptochaetium Presl (Poaceae: Stipeae) and related genera reconstructed from nuclear and chloroplast sequence datasets . Taxon. 58. 2. 2009. 375–380. 0040-0262. 10.1002/tax.582005. pdf
5. 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.
6. 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)
7. 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. 41971613. pdf
8. Thomasson. Joseph R.. Berriochloa Gabeli and Berrichloa Huletti (Graminae: Stipeae), two new grass species from the late miocene Ash Hollow Formationof Nebraska and Kansas. Journal of Paleontology. 79. 1. 2005. 185–199. 0022-3360. 10.1666/0022-3360(2005)079<0185:BGABHG>2.0.CO;2. 2005JPal...79..185T . pdf