Monographs Details: Ilex
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Description:Species Description - The fifty-five species of Ilex treated in this paper may be divided first into two groups. The section Guayanoilex Edwin with about twenty-four species is largely endemic in the Guayana Highland. The remaining thirty-one show relationships with Ilices typical of several other floras.
Discussion:Ilex cowanii Wurdack is close to Ilex boliviana Britton, a species of the high Andes native to Bolivia and Ecuador. Ilex inundata Poepp. ex Reiss., I. conocarpa Reiss. and I. psammophila Reiss. are species of the lowland and mountain slope floras of southern and eastern Brazil and also of lowland Colombia. I conocarpa Reiss. is also close to the species of southern Brazil such as I. microdonta Reiss. I. tateana Steyerm. and I. laureola Tr. & PL are related to lowland Amazonian species such as I. brasiliensis Loes., although both are found at higher elevations. I. guianensis (Aubl.) 0. Ktze. has its widest distribution in Central America and the Caribbean Islands. I. martiniana D. Don., I. jenmania Loes. and I. casiquiarensis Loes. are representative of species of the Guianas and northern Brazil. I. ptariana Steyerm. and I. parvifructa Edwin are very closely allied to I. glaucophylla Steyerm., a species of maritime Venezuela. I. theezans var. riedelii is close to I. paraguariensis St. Hilaire of Brazil and Paraguay. I. macarenensis Cuatr. is representative of the montane species of Colombia such as I. colombiana Cuatr. Finally I. andarensis Loes. is a native of the Andes Mountains of Peru.
The species of the section Guayanoilex undoubtedly arose in or very near the Guayana Highland while the remainder spread into the flora from other areas. Twenty-two species and seven varieties not before described are new presented. All are endemic in the Guayana Highland. Thirteen of the species and two varieties are included in a new section, which in turn is composed of two new subsections and also two n e w series.
The descriptions of these taxa do not contain data on prophylla, prophyllate bracts or stipules. N o n e of these seem to be taxonomically significant. The basic inflorescence types in Ilex are trichotomous axillary cymes -'^ and dichasia, either simple or compound (Fig. 26).
The cymes at times are reduced to one flower which is borne on a pedicel that in turn is on a peduncle (as indicated by the presence of an abscission line or prophyllate bracts or both). In the descriptions that follow the flowers so situated are described simply as "pedicellate." In the genus truly pedicellate female flowers (where no peduncle is developed) are very rare or lacking.