Dypsis commersoniana

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Dypsis (DIP-sis)
commersoniana
(kohm-mehr-son-ee-AHN-ah)
6373596567 d2f069cd87 o.jpg
Cooper city FL. Photo by Kyle Wicomb.
Scientific Classification
Genus: Dypsis (DIP-sis)
Species:
commersoniana
(kohm-mehr-son-ee-AHN-ah)
Synonyms
None set.
Native Continent
Africa
Africa.gif
Morphology
Habit: Clustering
Leaf type: Pinnate
Culture
Survivability index
Common names
None.

Habitat and Distribution

South East Madagascar. Lowland rain forest; alt. about 120 m. (0-499 m.)
Northern New South Wales. Photo by Daryl O'Connor.

Description

Clustering palm. STEMS 1.8-5 m tall. LEAVES irregularly pinnate; sheaths only known from their distal part, with rounded shoulders and a few scattered scales; petiole 5-21 cm long, 2.5-3 mm in diam., flat adaxially, with dense minute reddish scales; rachis 21-38 cm long, in mid-leaf 2-2.5 mm wide, with dense to scattered scales; leaflets in groups of 2 or irregular, 4-7 on each side of the rachis (interval 2-9 cm), distally sigmoid, proximal 5-23 x 0.4-1.6 cm, median 11-28 x 1.3-2.5 cm, cuneate at the base, acuminate, the distal leaflets often praemorse-denticulate on the distal lower margin, glabrous, top pair forming a deeply lobed flabellum 15-33 cm long, connate for 6-11 cm, the lobes 12-23 x 3.4-5 cm, with denticu-late-praemorse apices 2-4 cm wide and with the teeth continuing along the distal margin, and 6-7 main veins, leaflets glabrous except for the very base. INFLORESCENCE interfoliar, branched to 2 orders; peduncle about 24 cm long outside the sheath, compressed, 2.5-6 mm wide distally, with rather dense minute reddish scales; prophyll about 15 cm long outside the sheath, opening only in the distal 1-3 cm, with scattered scales; peduncular bract inserted at 12 cm above the sheath apex, about 13 x 0.6 cm, with scattered scales, split over its length, deciduous; rachis 20-33 cm long, with 6-11 branched and 10-13 unbranched first order branches, the proximal with a rachis to 8 cm and up to 7 rachillae; rachis bracts up to 4 x 2.5 mm; rachillae 3-14 cm long, 0.5-1 mm in diam., minutely puberulous; triads rather distant, superficial; rachilla bract concave, apiculate. STAMINATE FLOWERS with sepals 0.5-0.7 x 0.7-1 mm, keeled and gibbous, orbicular, rounded; petals 1.2-1.8 x 0.9-1.2 mm, elliptic, acute, striate; stamens 6, slightly biseriate (0.2 mm offset, the inner higher), the filaments 0.4-1 mm long, thin, the anthers 0.8-1.3 x 0.3-0.5 mm, dorsifixed, versatile, with parallel acute locules; ovary rudiment with wide base, distally subtrigonous pyramidal, 0.6-0.8 x 0.2-0.3 mm. PISTILLATE FLOWERS with sepals 0.5-0.6 x 0.5-1 mm; petals 2-2.4 x 1.8-2.3 mm; staminodes 6, minute; gynoecium when young to 1 mm high. FRUIT only known when young, up to 9 x 3 mm, with rather pointed apex. (J. Dransfield and H. Beentje. 1995)/Palmweb. EEditing by edric.

Culture

Warm, sheltered and moist. Cold Hardiness Zone: 10a

Comments and Curiosities

Known only from 2-5 localities.

Conservation: Critical. The distribution area is small, and under severe pressure by an expanding population. Nearly all lowland rain forest in the area has now been cleared. (J. Dransfield and H. Beentje. 1995)/Palmweb.


External Links

References

Phonetic spelling of Latin names by edric.

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

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

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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