Create your own conference schedule! Click here for full instructions

The Virtual Conference is located at

Abstract Detail

Floristics & Taxonomy

Lopes Silva, Rafael Francisco [1], Silva, Anauara Lima [2], Souto, Flávio Sousa [3], Costa Silva, Rafael [3], Agra, Maria [4].

The significance of the stem and leaf anatomy of three species of Cestrum (Solanaceae), endemic to Brazil.

Cestrum L. is the most representative genus of the tribe Cestreae G. Don, and one of the largest in the Solanaceae family, with about 230 species, of which 28 occur in Brazil. Cestrum is characterized as unarmed shrubs, trees, or rarely vines, with simple leaves, inflorescences many-flowered, and tubular flowers. The taxonomy of Cestrum is considered relatively difficult, because its species have great interspecific morphological uniformity, and are distinguished by small differences, and also present a remarkable intraspecific variation. We conducted a study of the anatomy of stem and leaf of three species of Cestrum (C. corymbosum Schltdl., C. obovatum Sendtn., and C. gardneri Sendtn.), endemic to Brazil, in order to find significant characters to its taxonomy. The study was performed following the usual techniques in plant anatomy, and analyzed by light and scanning eletronic microscopy. The stem is somewhat triangular in C. corymbosum, and circular in C. gardneri and C. obovatum; all species showed siphonostelic vascular cylinder, with sclereids and sclerenchyma in C. corymbosum. The pattern of vascular system of petiole and midrib is bicolateral, which is a pattern common to all Solanaceae species. The petioles are semicircular and flat adaxially in C. obovatum and C. corymbosum, with a central vascular bundle in arch-shaped, and two accessories bundles facing the adaxial surface; C. gardneri showed petiole semicircular with adaxial wings and two accessories bundles. The three species showed midrib biconvex with vascular bundle in arch-shaped, and the mesophyll dorsi-ventral, a single stratified palisade parenchyma, and a multi-stratified spongy parenchyma. The margin is rounded in C. corymbosum and C. gardneri, and recurved in C. obovatum. The leaf epidermis showed sinuous anticlinal cell walls on the both surfaces of all three species, and also presented hypostomatic pattern, with three types of stomata: anisocytic, anomotetracytic and anomocytic. Cestrum gardneri showed simple, multicellular, and glandular-stipitate trichomes on the entire leaf epidermis. The anatomy of the medullary region of the stem, the petiole, the leaf margin, as well as the epidermis and its appendages were the most significant characters as a support for the taxonomy of the studied species of Cestrum.

Log in to add this item to your schedule

1 - Universidade Federal de Pernambuco, Departamento de Botânica, Rua Professor Moraes Rego, s/n. Cidade Universitária, Recife, Pernambuco, 50.670-901, Brazil
2 - Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil
3 - Universidade Federal de Pernambuco, Rua Professor Moraes Rego, s/n. Cidade Universitária, Recife, Pernambuco, 50.670-901, Brasil
4 - Universidade Federal da Paraíba, Departamento de Biotecnologia, R. Tab. Stanislau Eloy, 41-769 - Conj. Pres. Castelo Branco III, João Pessoa, Paraíba, 58050-585, Brasil

Cestrum corymbosum
Cestrum gardneri
Cestrum obovatum
Cestrum anatomy.

Presentation Type: Oral Paper
Session: FTIII, Floristics & Taxonomy III
Location: Virtual/Virtual
Date: Friday, July 23rd, 2021
Time: 12:45 PM(EDT)
Number: FTIII002
Abstract ID:907
Candidate for Awards:None

Copyright © 2000-2021, Botanical Society of America. All rights reserved