New taxa of Impatiens (Balsaminaceae) from Madagascar. V. New species of Impatiens from Masoala Peninsula Author Fischer, Eberhard Author Rahelivololona, Marie Élisette text Adansonia 2007 3 29 2 317 332 journal article 10.5281/zenodo.5187598 1639-4798 5187598 Subgenus Trimorphopetalum (Baker) Eb.Fisch. DIAGNOSTIC CHARACTERS Lower sepal without spur, extrafloral nectaries on petiole lacking. A E H B C I D F G FIG. 1. — Impatiens scenarioi Eb.Fisch.& Raheliv. : A , habit; B , C , flower,lateral view; D , flower, frontal view; E , lateral sepal; F , G , lower sepal and spur; H , dorsal petal; I , lateral united petals. Rahelivololona, Saola & Scenario 136 (TAN). Scale bars: A, 1 cm; B-I, 1 mm. Impatiens ambanizanensis Eb.Fisch. & Raheliv. , sp. nov. ( Fig. 2 ) Impatiente salifii affinis sed ornamento sepali inferioris et petalibus lateralibus cum petalo superiore indistincte breviore quam petalo inferiore differt. FIG. 2. — Impatiens ambanizanensis Eb.Fisch. & Raheliv. : A , habit; B , C , flower; D , lateral sepal; E , F , lower sepal; G , dorsal petal; H , lateral united petals. Rahelivololona, Saola & Scenario 145 (TAN). Scale bars: A, 1 cm; B-H, 1 mm. TYPUS . — Madagascar . Masoala, Ambanizana-Ambohitsitondroina, au pied d’Ambohitsitondroina vers 900 m , 19.II.2002 , Rahelivololona, Saola & Scenario 145 (holo-, TAN). DESCRIPTION Perennial herb, with creeping rhizome entirely pubescent. Stem ascending to erect, up to 10-12 cm tall. Leaves alternate, greenish with darker reddish veins, petiole 9-13 mm long, lamina ovate, 23-30 × 12-20 mm , margin crenate, with 4 or 5 pairs of teeth with a short gland-tipped appendage. Inflorescence with solitary axillary flowers. Pedicel up to 5-6 mm long, curved at apex, pubescent. Flower with greenish lateral sepals, petals entirely maroon. Lateral sepals lanceolate, pilose outside, 2-3 × 1 mm . Lower sepal navicular, broadly ovate, pilose outside, inside with distinct ornamentation, producing broad rib-like crests on the secondary nerves, 5-6 × 5 mm . Dorsal petal cucullate, pilose outside, 8 × 3.5 mm . Lateral united petals glabrous, 10 mm long, upper petal 5-6 × 1-1.5 mm , lower petal 7 × 4-4.5 mm . Anthers 3 mm long. Ovary 3 mm long. Fruit unknown. FIG. 3. — Impatiens salifii Eb.Fisch. & Raheliv. : A , habit; B , leaf; C , detail of leaf margin; D -F , flower; G , lateral sepal; H , lower sepal; I , dorsal petal; J , lateral united petals. Rahelivololona, Saola & Scenario 141 (TAN). Scale bars: A, B, 1 cm; C, 5 mm; D-J, 1 mm. REMARKS Impatiens ambanizanensis is related to I. salifii Eb.Fisch. & Raheliv. from Masoala Peninsula, but differs in the ornamentation of the lower sepal producing broad rib-like crests on the secondary nerves (lower sepal with central ridge and 7 or 8 rib-like crests surrounding c. 7 holes on each side in I. salifii ) and the lateral united petals with upper petal only slightly shorter than lower petal (upper petal distinctly shorter in I. salifii ). HABITAT Montane rainforest at 900 m . DISTRIBUTION Madagascar , Masoala Peninsula, only known from the type collection.