Dypsis betamponensis

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Dypsis (DIP-sis)
Madfagascar. Photo by Dr. John Dransfield, Royal Botanic Gardens, Kew/Palmweb.
Scientific Classification
Genus: Dypsis (DIP-sis)
None set.
Native Continent
Habit: Solitary
Leaf type: Entire leaf bifid.
Survivability index
Common names

Habitat and Distribution

Dypsis betamponensis is endemic to Madagascar. Only known from a single
Betampona, Madagascar. Photo by Dr. A. Britt, Royal Botanic Gardens, Kew/Palmweb.
collection from Betampona.


Small solitary palm to 1 m. LEAVES entire bifid, with the sheath about 11 cm long, 6.5 mm in diam., with sparse reddish scales and about 2 mm high auricles; petiole about 6 cm long, 2.5-3 mm in diam., with reddish scales; lamina 49- 52 cm long, midrib 21.5 cm, lobes 30 x 5.7 cm, main veins about 7, with lines and bands of reddish scales, apices 0.8-1.8 cm wide, longdentate. INFLORESCENCE about 63 cm, branched to 1 (2) order(s); peduncle about 41 cm long, about 2 mm in diam., glabrous; prophyll about 30 cm long, 1 cm wide, borne at 10.5 cm above the base of the peduncle, with scattered pale brown scales; peduncular bract inserted at about 30 cm from the base of the peduncle, about 12 cm long; rachis about 16 cm long, with sparse long (1-2 mm) red curly hairs, especially in the axils of rachillae, with 1 branched and 22 unbranched first order branches, the branched one with 3 rachillae; rachillae reflexed, 3-5.2 cm, about 1 mm in diam., glabrous, with quite dense triads. STAMINATE FLOWERS with sepals imbricate, 0.6-0.8 x 0.8-1.1 mm; petals 0.8-0.9 mm high; stamens 6, biseriate, didymous, the filaments 0.2-0.25 mm long and connate at their bases, anthers 0.2-0.35 mm long and wide, in the type often with 4 fertile, 1 sterile and 1 missing or vestigial stamen; pistillode about 0.2 mm high. PISTILLATE FLOWERS only known from very young buds, with sepals imbricate, the petals still enclosed within. FRUIT unknown. (J. Dransfield and H. Beentje. 1995)/Palmweb. Editing by edric.

The didymous stamens are very rare in entire leaved Dypsis species, and only D. catatiana, D. fanjana and D. singularis are similar in this respect. (J. Dransfield and H. Beentje. 1995).


From 2.C to 35.C. Likes regular watering and fertilize once a year and mulch. Cold Hardiness Zone: 10a

Comments and Curiosities

A small solitary palm with entire leaves, much-branched inflorescences, and didymous stamens; distinct, and presumably extinct as well. The species name is derived from the type locality. (J. Dransfield and H. Beentje. 1995)/Palmweb.

This species has come in under quite a few different names, but is quite distinctive with its thick leathery leaflets. Some forms have reddish brown hairy trunk and will clump growing to 2 m tall and will tolerate. (Utopia Palms & Cycads)

External Links


Phonetic spelling of Latin names by edric.

Special thanks to Geoff Stein, (Palmbob) for his hundreds of photos.

Special thanks to Palmweb.org, Dr. John Dransfield, Dr. Bill Baker & team, for their volumes of information and photos.

Glossary of Palm Terms; Based on the glossary in Dransfield, J., N.W. Uhl, C.B. Asmussen-Lange, W.J. Baker, M.M. Harley & C.E. Lewis. 2008. Genera Palmarum - Evolution and Classification of the Palms. Royal Botanic Gardens, Kew. All images copyright of the artists and photographers (see images for credits).

Dransfield, J. & Beentje, H. 1995. The Palms of Madagascar. Royal Botanic Gardens, Kew and The International Palm Society.

Many Special Thanks to Ed Vaile for his long hours of tireless editing and numerous contributions.

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