Impatiens mananteninae Eb. Fisch.

Fischer, Eberhard & Rahelivololona, Marie Elisette, 2002, New taxa of Impatiens (Balsaminaceae) from Madagascar. I, Adansonia (3) 24 (2), pp. 271-294 : 290-293

Impatiens mananteninae Eb. Fisch. & Rahe-

livololona, sp. nov.

Ab omnibus speciebus ex grege Impatiens arachnoide differt foliis lanceolato-oblongis cum petiolo vaginato et petalo dorsale angustiore.

TYPUS. — Rahelivololona, T 5, Madagascar, Tsaratanana , fond de ruisseau, vers 1850 m (holo-, TAN; iso-, P) .

Erect herb up to 50 cm tall, densely pilose.

Leaves dark green with greyish indumentum,

Impatiens (Balsaminaceae) from Madagascar. I

petiole 5-13 mm, lamina 32-40 × 12-17 mm, ovate-lanceolate, acuminate, margin dentate. Flowers greenish with dark brown venation. Pedicels up 13 mm long, covered with whitish scales. Lateral sepals 2, 1.5 × 0.5 mm. Lower sepal 4 × 2 mm, with darker relief forming bars and translucid windows. Dorsal petal hood-like, 5 × 2.5 mm, with hairs on dorsal crest. Lateral united petals 6 mm long, upper petal 1.5 × 0.5 mm, lower petal 4 × 2 mm, with tuberculous crest on inner margin. Anthers 2 mm long. Ovary 1.5-2 mm long. Fruit unknown. — Fig. 15.

HABITAT.— Montane rain forest, at 1850 m.

DISTRIBUTION.— Madagascar, only known from the type collection .

Impatiens pilosissima differs from all Madagascan species of subg. Trimorphopetalum in the large habit (up to 50 cm tall) with densely pilose stems and leaves and the small flowers,

Impatiens (Balsaminaceae) from Madagascar. I

which bear a characteristical crest between upper and lower lateral petal.

Figures

Fig. 15. — Impatiens pilosissima Eb. Fisch. & Rahelivololona:A, habit; B, C, flower; D, lateral sepal, E, lateral united petals; F, lower sepal, anterior view; G, lower sepal, lateral view. (Rahelivololona T5, TAN).