Tibouchina (Melastomataceae)

Tibouchina urvelliana
The Melastomataceae HomePage

Tibouchina Jenni Tonks

Jenni Tonks

The Melastomataceae is a tropical family of herbs, shrubs and trees, from 0.1 - 50 m. Leaves are simple to decussate with acrodromous venation. Flowers are 3- to 5-merous, typically inconspicuous, except for Tibouchina, the "glory bushes" which are planted as ornamentals.

Pollen light micrograph:
Tibouchina longifolia (Vahl.) Baill.
Heterocolpate, syncolpate, striate, prolate - spheroidal, ca. 16 x 15 µm. Pseudocolpi length of grain, colpori equatorially constricted, 1.5 µm wide, pores 2 x 6 µm, amb hexagonal.
Roubik & Moreno (1991).

Pollen scanning electron micrograph (SEM)
Heterocolpate (6 furrows, 3 pores), prolate with convex sides.
Polar measurement (10 measurements, range [ave.]): 45 -(49.5)- 57.5 µm
Equatorial measurement (10 measurements, range [ave.]): 50 -(56.5)- 65 µm
Sculpture: There is little visible sculpturing on the pollen grains, and the surface is fairly even (psilate).
Jenni Tonks

Production and Dispersal:

poor (thin wall)?

Fossil Occurrence:
Never Recovered?
I would be very grateful for any citations!

    Roubik, D.W. and Moreno P., J.E. 1991.
    Pollen and spores of Barro Colorado Island. Missouri Botanical Garden, Monographs in Systematic Botany 36. 268 p.

Thanks very much to Jenni Tonks, who writes, " I'm hardly a playnologist, but I must say that having studied Tibouchina a bit lately, I think it deserves a nomination. I've been admiring my SEM pictures, and they're very cool. I am a third year student at University of New South Wales in Sydney, Australia. . . . I am doing the subject "Evolution in the Australian Flora" (taught by Prof. Chris Quinn -OKD) , of which our pollen analysis is only a small part. I found it really interesting, though, and was very impressed with the SEMs. Our pollen analysis (each person had a different species) involved compiling a description from the SEMs, but we also analysed the pollen grains under the light microscope after acetolysing the pollen. Our aim was to produce a description of the pollen, based on grain type, class of pollen grain, examination of polar and equatorial planes of the grains, and descriptions of exine, apertures and sculpture."