Olax lanceolata Cavaco & Keraudren

Rogers, Zachary S., Malécot, Valéry & Sikes, Kendra G., 2006, A synoptic revision of Olax L. (Olacaceae) in Madagascar and the Comoro Islands, Adansonia (3) 28 (1), pp. 71-100: 86-88

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Olax lanceolata Cavaco & Keraudren


5. Olax lanceolata Cavaco & Keraudren  

( Fig. 5 View FIG )

Bulletin de la Société botanique de France 110: 245 (1963) GoogleMaps   . — Type: Madagascar, Prov. Toliara, Tuléar, Besifaka   GoogleMaps , [22°38’S, 43°38’E], 11.II.1955, fl., Service Forestier 12814 (holo-, P-0048891!; iso-, P!, TEF).

ADDITIONAL MATERIAL EXAMINED. — Madagascar. Prov. Mahajanga, Bora, aux environs d’Ampombolava (Antsohihy), [15°01’S, 48°12’E], 16.III.1965, fl., SF (Capuron) 24071 (P!, TAN!, TEF!) GoogleMaps   . — Berivotra, sur le plateau de Berivotra, au Sud de Majunga , [15°54’S, 46°34’E], [100 m], 24.XI.1965, fr., SF (Capuron) 24294 (P!, TEF!) GoogleMaps   .

Prov. Toliara, Morondava, 20°17’S, 44°17’E, 1990, ster., Rahantamalala 200 (P!). — Kiranomena , 5 km au Sud de Kiranomena , [19°36’S, 45°37’E], 11.VIII.1954, ster., SF 51-R-243 (P!, TEF) GoogleMaps   . — Analamary, Tuléar [23°00’S, 44°33’E], 6.II.1951, fl. galls, SF (Rasolofoson) 2839 (P!, TEF!) GoogleMaps   . — Bekinana, Befasy, Morondava , [20°36’S, 44°27’E], [80-100 m], 15.IX.1954, fl. galls, imm. fr., SF (Valitera) 10869 (P[2]!, TEF!) GoogleMaps   . — Ambohimahavelona, Tuléar , [23°26’S, 43°54’E], 24.I.1955, fl., SF (Bototsalaoendry) 12677 (P!, TEF!) GoogleMaps   . — Antanimieva STF, station vers Ankaro, Morombe , [22°16’S, 43°46’E], 28.III.1955, imm. fr., SF (Verdet) 13314 (P!, TEF!) GoogleMaps   . — Tsivonoakely, au Nord du Fiherenana , [23°09’S, 43°37’E], [0-50 m], 30.XII.1961, fr., SF (Capuron) 20217 (P!, TEF!) GoogleMaps   . — Tanandava, près de Tanandava , [21°43’S, 43°45’E], 26.V.1965, fl. galls, imm. fr., SF (Capuron) 24117 (P!, TEF!) GoogleMaps   .


Olax lanceolata   has flowers with 3 (rarely 4) petals, 3 stamens, 6 staminodes, and a non-accrescent calyx in fruit. The species is distinguished from O. madagascariensis   , the closest presumed relative, by its lanceolate or narrowly elliptic leaves with a length to width ratio of (3-)4-8:1 (vs. ovate or elliptic leaves with a l/w ratio of 2-3[-3.5]), leaf blades with a narrowly acute apex and cuneate base (vs. acuminate or rarely acute apex with a broadly rounded, obtuse, or rarely acute base), and by its smaller fruits (13-14 vs. 14-19 mm in diam.).


Since the type of Olax lanceolata   was collected in 1955, Cavaco & Keraudren were unable to describe the species until after the publication of the Flore. The common occurrence of galled flowers and the rarity of fruiting collections have made this species somewhat difficult to define. It is interesting that relatively few collections have been made of a species so widely distributed in the western half of the island, with only one new collection made in the past 40 years.


Olax lanceolata   occurs in dry and subarid forests located in western Madagascar from 0 to 600 m elevation (Fig. 11). The species has been recorded in flower in January through March and in the months of May and September. Fruiting takes place from November through December.


Ambihotse (SF 51-R-243, 2839, 10869, 12677, 13314, 24117).


Wood used to make boxes (SF 51-R-243).


Olax lanceolata   has been collected in two protected areas (Antanimieva, Bora). The EOO for the species is 121 000 km2 and the AOO is 80 000 km2 (grid cell size 100 × 100 km). Given these figures, O. lanceolata   is assigned a provisional conservation status of Least Concern (LC).


Parc de Tsimbazaza


Centre National de la Recherche Appliquée au Developement Rural