Himalayan Balsam (Impatiens glandulifera) is a large annual plant, native to the Himalayas (resulting in its the colloquial name of kiss-me-on-the-mountain^[1] in the UK). It typically grows to 1 to 2 m high, with a soft green or red-tinged stem, and lanceolate leaves 5–23 cm long. The crushed foliage has a strong musty smell. The flowers are pink, with a hooded shape, 3–4 cm tall and 2 cm broad; the flower shape has been compared to a policeman’s helmet, giving rise to the alternative common name Policeman’s Helmet. Although it does not range all over India and is by no means the only Impatiens native to that country, it is also known as Indian Balsam in countries where it is introduced.

(From Wikipedia, April 25, 2010)

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Robust succulent plants, usually more than 100 cm tall, glabrous. Leaves opposite-verticillate, 60-150 x 18-65 mm, elliptic-ovate, serrate, base glandular stipitate; petiole 30-35 mm long. Inflorescence short, compact. Peduncles up to 90 mm long. Bracts elliptic-ovate or lanceolate-ovate, 7-8(-10) mm long. Flowers pink-red or red-purple, c. 30 mm long. Lateral sepals oblique cordate, 7-9 mm long. Lower sepal saccate, abruptly ending in a spur 5-6 mm long; spur incurved. Anterior petal orbicular-depressed, 7-8 x 12 mm; dorsally crested, apex bilobed. Lateral united petals 26 mm long, unequal; lower one larger (15 mm), upper with a thin incurved appendage. Capsule broadly clavate, 14-18(-25) mm long, nodding. Seeds sub globose, 3 mm broad, rugose.

(From EOL via efloras.org)