A PRELIMINARY REVISION OF PHILIPPINE MYRTACEiE. 333 
species, as yet represented by sterile or incomplete material, may further 
add to the list of genera. 
The material examined has consisted of the entire herbarium of this 
Bureau and occasional other sheets of recent collection. This has in- 
cluded practically all of Cuming’s numbers in this family : two important 
collections practically unknown to me are those of Vidal and Loher, 
the former especially interesting as often indicating his ideas as to the 
identity of certain of Fernandez-Villar’s determinations. These, it is 
understood, were made from probability and memory, rather than from 
direct comparisons. 
A considerable number of specimens from other closely related regions 
are also in this herbarium, and direct comparison has often enabled the 
solution of questions that would otherwise have been held in abeyance. 
Most frequently the decision thus reached has been that the Philippine 
species has to be considered distinct : in several critical cases, I have not 
yet been able to make direct comparison with the species supposed to be 
most closely allied. I have to further gratefully to acknowledge as- 
sistance from W. W. Smith, Esq., of the Royal Botanic Garden, Calcutta, 
J. II. Maiden, Esq., of the Botanic Gardens, Sydney, Australia, and 
Doctors Treub and Valeton, Buitenzorg, Java. 
KEY TO THE PHILIPPINE GENERA OF MYRTACEHL. 
Fruit a capsule. 
Petals separate. 
Leaves opposite 2. Mearnsia 
Leaves alternate. 
Flowers axillary, solitary, or rarely in three’s at the apex of short lateral 
branches 6. Leptospermum 
Flowers in umbels or panicles. 
Stamens free - 3. Xanthostemon 
Stamens more or less united 4. Tristania 
Petals united into an operculum - 5. Eucalyptus 
Fruit indehiscent ; leaves opposite. 
Corolla wanting 1. Osbornia 
Corolla present. 
Ovary-cells 4 or 5 8. Decaspermum 
Ovary-cells 1 to 3. 
Leaves glabrous - - 10. Eugenia 
Leaves pubescent. 
Under surface of leaves white-tomentose 9. Rliodomyrtus 
Leaves r.ot white-tomentose 7. Psidium 
1. OSBORNIA F. Muell. 
Osbornia octodonta F. Muell. Fragm. 3 (1862) 31. 
Luzon, Province of Tayabas, Laguimanoc, Vidal 315 ; Pitogo, For. Bur. 10237 
Curran: Province of Camarines, Ragay, For. Bur. 101/16 Curran. Negros, Prov. 
of Negros Occidental, Cadiz Nuevo, For. Bur. 1/219 Everett. Basilan, Hallier 
s. n.: Palawan, Malampaya Bay, For. Bur. 1/1/90, 7 1/53 Curran. 
