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Published In: Species Plantarum 1: 82. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Flower/Fruit: Fl. & Fr. Per.: March-December.
Type: Type: Ascension Is., Osbeck (LINN).
Distribution: Distribution: Pakistan (Sind, Baluchistan, Punjab, N.W.F.P., Gilgit & Kashmir); throughout the tropics.
Comment/Acknowledgements: Aristida adscensionis is a pan-tropical weed and morphologically extremely variable. There are no discontinuities between var. adscensionis and either var. pumila or var. ehrenbergii and the distinctions between them are hardly worth maintaining. The same may be said of Aristida depressa, an extreme form completely intergrading with Aristida adscensionis. The distinction between annuals and perennials in the tropics and subtropics is not always very clear and often appears to be a facultative difference of little taxonomic consequence. This is particularly true in Aristida adscensionis where the separation of perennial plants as Aristida caerulescens cannot be justified. Indeed, perennial plants, otherwise indistinguishable from typical var. ehrenbergii are seen in the Middle East.

Six-weeks Tripleawn (a North American name) is probably grazed by cattle, but nothing more definite about its economic value in Pakistan seems to be known.

Illustration: Aristida adscensionis L. (Illustration)
Map Location: A-8 Gilgit Agency: Maiyun, Hunza, 6-7000', R.R. Stewart 26662 (K); B-6 Peshawar dist.: Islamia College, R.R. Stewart 9078 (K); 4 miles from Torkhum on way to Landi Kotal, M. Qaiser 6160 (KUH); Mardan dist.: Dargai, Sh. Ali 26064 (K); B-7 Swat dist.: near Madian, c.5000', R.J. Rodin 5521 (K, RAW); Hazara dist.: 3 miles from Garhi Habibullah on way to Abbottabad, S.A. Faruqi & M. Qaiser 3392 (KUH); Kashmir: Muzaffarabad, Sultanul Abedin & M. Qaiser 9193 (KUH); B-8 Baltistan: Skardu, Schiagintweit 677 (K); ibid., C.B. Clarke 29977, 30506 (K); C-6 Kohat dist.: Thal, Sadiq Masih 4 (K); D.I. Khan dist.: Pezu, A. Rahman Beg 25815 (K); ibid., M.A. Siddiqi & Zaffar Ali 3752 (RAW); C-7 Rawalpindi dist.: Murree, Tret, 4000', E.W. Trotter 6 (K, RAW); Attock dist.: Khairabad, R.R. Stewart 27837 (K, KUH, RAW); Wah Garden, M. Qaiser 285 (KUH); Gujrat dist.: Pabbi Hills, R.N. Parker 3325 (K); Jhelum dist.: Choa Saidan Shah, 11 April 1957, Iftikhar Ahmad s.n. (RAW); about 2 miles from Chakwal on way to Jhelum, S.A. Faruqi & M. Qaiser 2896 (KUH); Campbellpur dist.: Hasan Abdal, 1800', R.R. Stewart 13886 (KUH); D-4 Sibi dist.: 2 miles from Ziarat on way to Loralai, M. Qaiser 155 (K); Quetta dist.: c.16 miles from Quetta on way to Spezand, M. Qaiser 2475 (K); Urak, M. Qaiser 47 (KUH); D-5 Loralai dist.: about 6 miles from Kingri on way to D.G. Khan, M. Qaiser 2534 (KUH); Zhob dist.: Kila Saif Ullah, 5300', Mohd. Jafri 86 (RAW); D-6 D.I. Khan dist.: Sulaiman Range, 700-900 m, K.H. Rechinger 30001 (K); D.G. Khan dist.: 21 miles from D.G. Khan on way to Fort Munro, Sultanul Abedin & Abrar Hussain 9652 (KUH); D-7 Lyallpur dist.: Sangla Hill, c.1000', R.R. & I.D. Stewart 1472 (K, RAW); ibid., Sultan Ahmad 3 (KUH); D-8 Lahore dist.: August 1846, T. Thomson s.n. (K); E-4 Kalat dist.: Bolan Pass, J.J. Norris 173 (K); about 50 miles from Quetta on way to Sibi, S.A. Faruqi & M. Qaiser 2259 (KUH); Baluchistan: Yateabad, 3400', Shaharyar Khan 22 (RAW); F-2 Makran dist.: 8-25 Km W of Awaran, towards Turbat, K.H. Rechinger 27719 (K); F-3 Makran dist.: 32 miles from Awaran on way to Hoshab, Sultanul Abedin 795 (KUH); Kalat dist.: 30 miles from Jhal Jhao on way to Awaran, Sultanul Abedin & M. Qaiser 7480 (KUH); G-2 Makran dist.: 59 miles from Pasni on way to Gwadar, M. Qaiser, Asad Raza & Abrar Hussain 987 (KUH); G-4 Karachi dist.: Mango Pir, A. Rahman Beg 25653 (K); University Campus, Karachi, March 1964, S.I. All s.n. (KUH); G-5 Hyderabad dist.: Kotri - Jam Shoro Road, A. Jails 1235 (RAW); G-6 Tharparkar dist.: Budhe-Sar, Nagar Parkar, M. Qaiser, A. Ghafoor & S. Abrar 4096 (KUH).

 

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Annual or short-lived perennial, forming erect or sprawling tufts 10-100 cm high. Leaf-blades linear, up to 20 cm long and 3 mm wide, expanded or folded. Panicle up to 30 cm long, occasionally lax, usually ± contracted about the main branches, sometimes narrow and dense. Spikelets pallid, green or purple; glumes unequal, linear-lanceolate to lanceolate, scaberulous on the keel, emarginate and mucronate or acute but never awned, the upper 5-10 mm long, the lower 1-3 mm shorter; lemma 5-13(17) mm long, sometimes no longer than the glumes but usually exceeding the upper by 1-2 mm or more, laterally compressed, convolute, scabrid on the keel or sometimes generally scaberulous on the upper part, passing into the awn without constriction or articulation; callus narrowly oblong, 0.5 mm long, obtuse; central branch of the awn 7-25 mm long, the laterals subequal or occasionally conspicuously shorter.
 
 
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