A revision of the genus Aglaonema (Araceae)

Abstract

Nicolson, Dan Henry. A Revision of the Genus Aglaonema (Araceae). Smithsonian Contributions to Botany, 1 : 1-66. 1969. -This revision of Aglaonema (ranging from northeastern India through New Guinea) is based on study of over 1500 herbarium specimens in 33 herbaria, supplemented by field studies and over 100 personal collections made in southeastern Asia over a period of 18 months. Much of the literature of the genus is reviewed, particularly on cytology, embryology, and morphology. The taxonomic portion of the text includes keys, synonymies, descriptions, notes on range, habitat, typification as well as discussion of taxonomic and nomenclatural problems.SMITHSONIAN CONTRIBUTIONS TO BOTANY this subject and their own findings, said, "We feel that on reinvestigation many reports of Helobial type may turn out to be of the Cellular type."Campbell (1912, p. 107) reported that in pictum the polar nuclei fused, but he did not study further development; however, in Aglaonema simplex and probably also in A. modestum, and A. commutatum there was no fusion of the polar nuclei, according to Campbell (1912, p. 107). These two nuclei remained separate and each divided, making four free nuclei, after which cell wall formation began. In other cases, in A. simplex, discoid groups of flat cells were observed."These are bounded by delicate but evident cell walls and in the undivided cavity of the sac may be seen several free nuclei between which walls are beginning to form (Campbell, 1912, p. 107)." Gow ( 1908, p. 40) reported that in Aglaonema versicolor (A. pictum) endosperm formation is of the cellular type. In A. nitidum, Gow ( 1913, p. 128) reported that the endosperm nucleus gives rise to a heavy-walled endosperm developing simultaneously with the embryo.Campbell (1912, p. 108) reported that, in Aglaonema simplex, the first formation of endosperm is at the chalazal end and proceeds upward, filling the sac with a few large cells. The smaller endosperm cells at the chalazal end look like antipodals.

Schismatoglottideae (Araceae) in Malesia I - Schismatoglottis

“…According to Nicolson (1969), Schismatoglottis celebica was also based on a Zollinger collection, a duplicate of the type of Aglaonema subundulatum, also at P, but not identified by Zollinger to species (A.H. has seen this specimen and it is determined by Zollinger as Aglaonema; Engler has determined it as Schismatoglottis celebica). Since the type of A. subundulatum is not annotated by Engler, it would appear that these two names, though apparently based on the same collection, are not homotypic.…”

Aglaonema tassai (Araceae; Tribe: Areae) – sp. nov. From Arunachal Pradesh, Northeast India

“…This genus inhabits humid and heavily shaded forests of southeastern Asia, northeastern India, southern China, Indonesia, Malaysia and New Guinea (Li & Boyce 2010;Hay 1998). Nicolson (1969) from Smithsonian Institute was the first to revise the genus Aglaonema Schott of Southeast Asia, and has reported the existence of 76 binomials of which 21 are accepted. These plants are primarily native to Southeast Asian countries.…”

Four new records of Aroids for Bangladesh

“…The specimens have been identified with the help of Engler (1915), Nicolson (1969Nicolson ( , 1987, Noltie (1994), Mayo (1985) and Rao and Verma (1976).…”