Published In:
Hortus Kewensis; or, a catalogue . . . 2: 3. 1789. ( Hort. Kew.)   
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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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Contributor Text:
Peter C. Hoch and Peter H. Raven
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Synonym Text:
Hartmannia rosea (L' HJr. ex Ait.) G. Don in Sweet, Hort. Brit. ed. 3. 236. 1839.
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Type:
Type locality: Peru.
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Distribution:
Distribution: Native from central and southern Texas, USA, throughout Mexico and Central America to El Salvador, and throughout South America; naturalized throughout the warmer regions of the world. Sandy to clay soils, along creeks or in low weedy places, l000-2000 m elev. According to Stewart (loc. cit. 508. 1972), O. rosea is an old introduction from Mexico, which has run wild in many areas of Pakistan. He lists the following additional localities for which I have not seen specimens: Hazara, Poonch, Kashmir, Jhelum Valley. Fl. Per.: Apr-Sep.
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Comment/Acknowledgements:
One collection of Oenothera rhombipetala Nutt. ex Torr. & A. Gray has been collected in Afghanistan, Mazar-i-Sharif, Koelz 13192 (NA), and perhaps it may also occur in Pakistan. This species is easily distinguished from the others by its dense terminal spikes 1-3 dm long of yellow flowers, the slender buds 2-4 mm in diameter, rhombic-obovate petals and arcuate-cylindric capsules 12-16 mm long and ca. 2.5 mm in diameter. Oenothera rhombipetala is native in the Great Plains of the United States.
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Illustration:
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Map Location:
B-6 1 mi N of Dir, Qaiser & Ghafoor 6471 (KUH); B-7 Swat, Shahderi, 16.4.1958, Stewart s.n. (RAW); 2 mi from Mingora to Kalam, Sultanul Abedin 8224 (KUH); Hazara, 8 mi N of Murree, Farooqi & Qaiser 2951 (MO); 2.5 mi from Balakot on way to Naran, Farooqi & Qaiser 3221 (KUH); 30 mi from Balakot on way to Kaghan Road, Farooqi & Qaiser 3342 (KUH); 12 mi from Nathia Gali on way to Abbottabad, Farooqi & Qaiser 3431 (KUH); Abbottabad, Kaur 93 (KUH); Haripur, Qaiser & Ghafoor 1991 (KUH); 8 mi from Nathia Gali to Abbottabad, Qaiser & Ghafoor 1991 (KUH); 8 mi from Nathia Gali to Abbottabad, Qaiser & Ghafoor 2012 (KUH); Kangur, Qaiser & Ghafoor 4876 (KUH); near Povi Bridge (Balakot), Qaiser & Ghafoor 5162 (KUH); Nathia Gali, S. Qureshi 177 (KUH); Abbottabad, Sultanul Abedin 2859 (MO), 2882 (KUH), 2954 (KUH); 4 mi from Balakot to Kaghan, Sultanul Abedin & Qaiser 8694, 8701, 8720 (KUH); C-6 Kurram, Parachinar, M. Siddiqi & Y. Nasir 6552 (RAW); C-7 Rawalpindi, Murree, Murree Hills, Qaiser & Sultanul Abedin 5581 (KUH); near Parachinar, Kurram Valley, Qaiser & Sultanul Abedin 6038 (KUH); M. A. Siddiqi & Y. Nasir 6552 (RAW) Murree, 1968, S. Qureshi s.n. (KUH); on way to Kashmir Point, Murree, 1968, S. Qureshi s.n. (KUH); Murree, Rodin 5366 (MO); Karot, Sultanul Abedin 2761 (KUH); Murree, Sultanul Abedin 2859, 7332, 7337 (KUH); 34 mi from Rabal to Dir, Sultanul Abedin 7836, 7837 (KUH); 28 mi from Rawalpindi to Murree, Sultanul Abedin 7612 (KUH); Murree, 1953, s. col., s.n. (KUH); Kashmir Point, 1958, s. col., s.n. (KUH); Sargodha, Sakesar, Salt Range, I. Ahmad s.n. (Raw); Sakesar, near Air Force Halt, Qaiser 2659 (KUH); D-6 D. G. Khan, Sulaiman Range, 1600 m, J. Lamond 1386 (RAW, E)
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Well-branched perennial herb, flowering the first year, stems ascending, 1-4 dm tall, densely strigillose, rarely mixed with sparse villous hairs. Leaves subentire or sinuate-pinnatifid, elliptic or rarely narrowly ovate, 2-5 x 1-2.5 cm, the petiole 2-25 mm long. Flowers opening near sunrise; mature buds erect. Floral tube 4-8 mm long. Sepals 7-12 mm long; sepal tips 0.1-0.5 mm long. Petals rose to rose-purple, obovate, 4-12 mm long. Style 0.8-1.4 cm long; the stigma surrounded by the anthers at anthesis. Capsule clavate, 1.3-3 cm long, tapering to a sterile stipe-like portion 0.5-2 cm long, the ridge on each valve ± prominent, the valve narrowly winged. Seeds in several indistinct rows in each locule, oblong-obovoid to obovoid, 0.7-0.9 mm long, the surface finely granular, with a dark spot at each end. Self-compatible and self-pollinating. Gametic chromosome number, n = 7 (rings of 14 in meiotic metaphase I).
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