Published In:
Prodromus Systematis Naturalis Regni Vegetabilis 14: 93. 1857. ( Prodr.)   
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(Last Modified On 6/2/2011)
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Acceptance
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Accepted
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(Last Modified On 6/3/2011)
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Synonym Text:
P.plebejum R.Br. var. effusum (Meisn.) Hook.f., Fl. Brit. Ind. 5: 28. 1886; P.corrigioloides sensu Schiman-Czeika & Rech.f. in Rech.f., Fl. Iran. 58: 73. 1968 p.p. non Jaub. & Spach 1845.
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Flower/Fruit:
Fl. Per.: March-October.
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Type:
Syntypes: India Orientalis regno Oude Wall. 1691/3 (K); Kumaon, Strachey & Winterbottom Himal 4.22 (K); Afghanistan, Griffith (G-DC, K).
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Habitat:
Grows from plains to 1300 m as a weed of cultivation, along roadside.
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Distribution:
Distribution: Bangla Desh, India, Pakisan and Afghanistan.
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Comment/Acknowledgements:
Polygonum effusum Meisn. has usually been considered as an infraspecific taxon of widely distributed species P. plebejum R.Br. Hook.f., l.c. has treated it as a variety of the latter taxon. Subsequent workers also followed Hook.f. Steward (Contr. Gray Herb. 5 (88): 1-129. 1930) reduced P. effusum to the synonymy of P. plebejum and did not even recognize it as a variety. However, P. effusum differs from P. plebejum in number of characters. In P. effusum the flowers are pedicellate, which are clearly exserted from ochreae, all tepals ± equal and obtuse at the apex and the stamens are 8 in number. Whereas in P. plebejum the flowers are almost sessile to subsessile, which are sunken among the ochreae, tepals unequal, outer tepals acute and the stamens are 5 in number. It is therefore evident from the foregoing dicusssion that P. effusum deserves a separate specific status instead of sinking it in the synonymy of P. plebejum.
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Map Location:
B-6 Arandu, SW of Drosh, 4000 ft, 27.4.1958; J.D.A.Stainton 2310 (BM,E); B-7 Swat Dist.: Buttkhela, Malakand Agency drying fields 2500 ft., R.R.Stewart 27530 (RAW); 7 miles from Peshawar towards Khyber Pass, R.J.Rodin 5287 (K); Batkhela, Malakand Agency, 2500 ft, R.R.Stewart 27530 (BM); C-6 Peshawar, April, 1907, Harold Deane s.n. (K); C-7 Rawalpindi Dist.: Nr. Khanna, Y.Nasir & Nazir (KUH); Saidabad, Kashmir, C.B.Clarke 28105 (K); Kashmir, 10. 1848, T.Thomson s.n. (K); D-7 Lyallpur (Faisalabad), March 18, 1927, R.R.Stewart s.n. (K); Chak No: 353, Lyallpur (Faisalabad) 20.3.1971, A.Rauf s.n. (RAW); B-8 Shangla hill, near Lahore, R.R.Stewart 1384 (RAW); F-4 Dadu Dist.: Manchar Lake, S.A.Farooqi & S.Abedin 357 (KUH); Manchar Lake, A.A.Anwar s.n. (KUH); Manchar Lake, Shah Hasan, S.I.Ali & S.Abedin 305, 336 (KUH); ibid, S.A.Farooqi & S.Abedin 356,357 (KUH); Karachi-Dadu, Amri to Laki near Amri station, J. Lamond 832 (E), Baluchistan, Stocks 385 (K); F-5 Sukker Dist.: Near Shikarpur, Ali, Tasnif & Ghori s.n. (KUH); Boodo Goth, 7 miles from Sakher along Indus River (Nasirabad loop) Shikarpur, Kamal A. Mali, S.Naqvi & M. Sharif 1980 (KUH); G-4 Karachi Dist.: About 7 miles from Dhabeji on way to Thatta, M.Qaiser, Saeeda Qureshi & S.Asad 464 (KUH); G-5 Hyderabad Dist.: Mirpur Sakro, S.Abedin & M.Qaiser 9382 (KUH); Nawabshah Dist.: Nawabshah, Sind, S.M.H.Jafri 4023 (KUH); Thatta Dist.: 12 miles from Sajawal on way to Thatta, M.Qaiser, A. Raza & A.Husain 699 (KUH); Dekh Khanani, Chaudhri Murad Khan’s Farm Deh Band, near Sean Hydri Thatta, S.Abedin & Abrar Husain 9435 (KUH).
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A profusely branched, prostrate annual herb with channelled stem, glabrous, internodes long. Leaves narrowly linear, sessile, up to 20 x 0.2-0.4 mm with indistinct veins. Ochrea membranous ± lacerate. Inflorescence an axillary cluster of 1-3 flowers per cluster. Flowers pedicellate, clearly exserted from the ochrea; pedicel 1.75-2 (-2.5) mm long, articulated, articulation almost in the middle or slightly below the middle of the pedicel. Tepals 5, pink, eventually turning white, all ± equal, c. 1.75 mm long, obovate, rounded. Stamens 8, c. 0.8 mm long. Styles 3 with 3 capitate stigmas. Nuts trigonous, black and shining.
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