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Monographia Aquifoliacearum - Loizeau Pierre-André & Gabrielle Barriera


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Aquifoliaceae of Neotropics

Loizeau P.-A. & G. Barriera


Ilex marahuacae Steyerm.

Habit, vegetative morphology.— Tree (petit), evergreen, 4 m tall. Current year's branchlets glabrous. Branchlets older than one year smooth or furrowed, greyish or reddish, glabrous. Lenticels on current year's branchlets absent or hardly visible. Internodes 0.5–2 cm. Stipules caducous, linear-triangular, 0.5 mm. Petiole glabrous, rough or grooved surface, 6–8 mm. Lamina ovate or elliptic, oblong (1:2), 6.5–11 X, 2.5–4.5 cm, papyraceous to coriaceous, glabrous abaxially. Base obtuse to rounded. Apex obtuse to acute, mucronate. Apex acuminate. Acumen 0.8–1.3 cm. Margin revolute, crenate to dentate, teeth inconspicuous (et très peu visibles). Teeth 5–10 ca., on the distal half of the margin. Midbrid adaxially impressed, glabrous. Midbrid abaxially raised, glabrous. Secondary veins abaxially evident, 4–6 pairs. Tertiary veins abaxially obscure. Ponctuation abaxiallly present.

Inflorescences.— Thyrse or solitary dichasium, proliferating.

Female flowers.— Thyrses axes solitary and axillary. Thyrses axes 10–15 cm. Cymes of order 1–2. Peduncles glabrous. Peduncles of order 1 7–9 mm. Pherophylls of order 1 at 5–6 tenth of the base. Peduncles of order 2 3–4 mm. Pherophylls of order 2 at 2–3 tenth of the base. Bracts linear-triangulate, glabrous, 1 mm, margin entire. Pherophylls of order 1 opposite, linear-triangulate, glabrous, 0.5–0.7 mm, margin entire. Female flowers 4 -merous. Calyx glabrous, margin ciliate or dentate, 2.5–3 mm in diam.

Fruits.— Fruit red, spherical, 4–6 mm in diam., 5–6 mm.

Distribution, ecology.— South America, Venezuela (Amazonas, Cerro Marahuaca), 1140 m, pente boisée le long du Caño Negro.

Illustrations.— • Dessin in Berry & al. (1995). Flora Venezuelan Guayana. • Planche Steyermark 130425 U. • Feuilles Steyermark 130425 U (IT). • Etiquette Steyermark 130425 U (IT). • Planche Steyermark 130425 MO (HT). • Etiquette Steyermark 130425 MO (HT). • Rameau Steyermark 130425 MO (HT). • Fruits Steyermark 130425 MO (HT). • Planche Steyermark 130425 NY.


Cite this publication as: ‘Loizeau, P.-A. & G. Barriera (2007). Aquifoliaceae néotropicales: Descriptions, Illustrations, Identification, et Recherche d'Information. Version: 1st march 2007. http://www.ville-ge.ch/cjb/.
Loizeau (1994) et Loizeau & Spichiger (1992) should also be cited (see Bibliography).