Aristida hygrometrica, copyright Kym Nicolson.

Belongs within: Poaceae.
Contains: Aristida adscensionis, Aristida section Chaetaria.

The Aristidoideae, wiregrasses, are a group of relatively narrow-leaved grasses most commonly found in dry, open habitats. The central awn-branch is plumose in species of the genus Stipagrostis but glabrous in Aristida.

Characters (from Grass Phylogeny Working Group 2001): Plants annual or perennial, caespitose, herbaceous, xerophytic or less commonly mesophytic. Culms solid or hollow. Leaves distichous; abaxial ligule absent or present as a line of hairs; adaxial ligule a fringed membrane or a fringe of hairs; blades relatively narrow, without pseudopetioles, venation parallel; sheaths non-auriculate. Inflorescences paniculate, bracts outside of the spikelets absent. Spikelets with bisexual florets, glumes 2, female-fertile floret 1, and no rachilla extension, cylindrical or laterally compressed, disarticulating above the glumes; lemma with three awns, the awns separate from each other, or fused below into a twisted column; palea short, less than half the lemma length; lodicules present or rarely absent, when present 2, free, membranous, glabrous, heavily vascularized; stamens 1 to 3; ovary glabrous, apical appendage absent, haustorial synergids absent, styles 2, free, close, stigmas 2. Caryopsis with the hilum short or long-linear; endosperm hard, without lipid, containing compound starch grains; embryo small or large, epiblast absent, scutellar cleft present or absent, mesocotyl internode elongated, embryonic leaf margins meeting. Basic chromosome numbers: x = 11, 12.

Aristidoideae [Aristideae]
| |--S. damarensisCV06
| |--S. garubensisCV06
| |--S. gonatostachysCV06
| |--S. hermanniiCV06
| |--S. lanipesCV06
| |--S. namibensisCV06
| |--S. pellytronisCV06
| |--S. plumosaAGF98
| |--S. pogonoptilaPP07
| |--S. ramulosaCV06
| |--S. sabulicolaCV06
| |--S. seelyaeCV06
| |--S. uniplumusCS77
| |--S. vulneransAGF98
| `--S. zeyheriGPWG01
| i. s.: A. adscensionisPP07
| A. aristidisD17
| |--A. a. var. aristidisD17
| `--A. a. var. chudaei Batt. & Trab. 1906D17
| A. arizonicaGPWG01
| A. basirameaV72
| A. brachyatheraD17
| A. californicaH93
| A. ciliataD17
| A. congestaGPWG01
| |--A. c. ssp. congestaGPWG01
| `--A. c. ssp. barbicollisGPWG01
| A. dichotomaV72
| A. divaricataH93
| A. exsertaLK14
| A. funiculataPP07
| A. hoggariensis Batt. & Trab. 1906D17
| A. holatheraLK14
| A. ingrataLK14
| A. kimberleyensisLK14
| A. longispicaV72
| |--A. l. var. longispicaV72
| `--A. l. var. geniculata [incl. A. intermedia]V72
| A. mendocina [incl. A. cordobensis]S06
| A. murina [=A. pallens var. murina Trin. 1849]S06
| A. mutabilisPP07
| A. necopinaV72
| A. obtusaD17
| A. oliganthaH93
| A. orcuttianaH93
| A. pallensS06
| |--A. p. var. pallensS06
| |--A. p. var. intermediaS06
| |--A. p. var. macrochaeta Hackel in Stuckert 1906S06
| `--A. p. var. tenuifoliaS06
| A. perniciosaLK14
| A. plumosa [incl. A. floccosa]D17
| A. pungensD17
| A. purpurascensV72
| A. purpureaGPWG01
| |--A. p. var. purpureaGPWG01
| |--A. p. var. fendlerianaH93
| |--A. p. var. longisetaGPWG01
| |--A. p. var. nealleyi [incl. A. glauca]H93
| |--A. p. var. parishiiH93
| `--A. p. var. wrightiiH93
| A. sahelicaD17
| A. setaceaS03
| A. setifoliaS06
| A. spegazziniiS06
| |--A. s. var. spegazziniiS06
| |--A. s. var. abbreviataS06
| `--A. s. var. pallescensS06
| A. spiciformisM83
| A. strictaCS90
| A. ternipesH93
| |--A. t. var. ternipesH93
| `--A. t. var. hamulosaH93
| A. tuberculosaV72
|--A. sect. ArthratherumB78
| |--A. arenaria Gaud. 1826G52 [=Arthratherum arenariumB78; incl. Ari. contorta Muell. 1855B78]
| | |--A. a. var. arenariaG52
| | `--A. a. var. hirsutaG52
| |--A. browniana Henr. 1926 [incl. A. muelleri, A. stipoides]G52
| `--A. hygrometrica Br. 1810G52
`--A. sect. ChaetariaB78

*Type species of generic name indicated


[AGF98] Abd El-Ghani, M. M., & A. G. Fahmy. 1998. Composition of and changes in the spontaneous flora of Feiran Oasis, S Sinai, Egypt, in the last 60 years. Willdenowia 28: 123–134.

[B78] Bentham, G. 1878. Flora Australiensis: A description of the plants of the Australian Territory vol. 7. Roxburghiaceae to Filices. L. Reeve & Co.: London.

[CS90] Corey, D. T., & I. J. Stout. 1990. Ground surface arachnids in sandhill communities of Florida. Journal of Arachnology 18: 167–172.

[CS77] Cramp, S., & K. E. L. Simmons (eds) 1977. Handbook of the Birds of Europe, the Middle East and North Africa: The Birds of the Western Palaearctic vol. 1. Ostrich to Ducks. Oxford University Press: Oxford.

[CV06] Craven, P., & P. Vorster. 2006. Patterns of plant diversity and endemism in Namibia. Bothalia 36 (2): 175–189.

[D17] Diels, L. 1917. Beiträge zur Flora der Zentral-Sahara und ihrer Pflanzengeographie. Nach der Sammelausbeute des Freiherrn Hans Geyr von Schweppenburg. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 54 (Beiblatt 120): 51–155.

[G52] Gardner, C. A. 1952. Flora of Western Australia vol. 1 pt 1. Gramineae. William H. Wyatt: Perth.

[GPWG01] Grass Phylogeny Working Group. 2001. Phylogeny and subfamilial classification of the grasses (Poaceae). Annals of the Missouri Botanical Garden 88 (3): 373–457.

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

[M83] Myers, R. L. 1983. Site susceptibility to invasion by the exotic tree Melaleuca quinquenervia in southern Florida. Journal of Applied Ecology 20: 645–658.

[PP07] Pandey, R. P., & P. M. Padhye. 2007. Studies on phytodiversity of Arid Machia Safari Park-Kailana in Jodhpur (Rajasthan). Bulletin of the Botanical Survey of India 49: 15–78.

[S03] Singh, J. N. 2003. Grasses and their hydro-edaphic characteristics in the grassland habitat of Nilgiris Biosphere Reserve, Tamil Nadu. Bulletin of the Botanical Survey of India 45: 143–164.

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

[V72] Voss, E. G. 1972. Michigan Flora. Part I. Gymnosperms and Monocots. Cranbrook Institute of Science and University of Michigan Herbarium.

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