Frank Almeda, PhD
Curator of Botany, Emeritus
Botany, Biodiversity, Evolution, Biogeography

Using flowering plants to address questions about plant biodiversity, biogeography, and evolution, I am interested in why some families of flowering plants are so species-rich and the factors that have promoted this diversification. Can certain families of plants be used as indicators of biodiversity hotspots and can this information be useful in conservation decisions? I am also studying species in a megadiverse family of plants like Princess Flowers (Melastomataceae) to determine how they are related to one another and where they fit into the tree of life for flowering plants.

Bruce Bartholomew
Research Associate and Fellow, Botany

My work in the Botany Department is centered mostly on the vascular plants of China. During the past forty years I have endeavored to build up the collection of Chinese specimens at the CAS herbarium both through collecting expeditions to China as well as through exchange with other institutions. I have been one of the plant family editors as well as an author for some treatments of the Flora of China, an international project that produced an English language flora of all the vascular plants of China.

Tom Daniel, PhD
Curator of Botany, Emeritus
Botany, Systematics, Evolution

For the past 30 years the major emphasis of my research has been the study of New World Acanthaceae (shrimp plants and their relatives). Although known in temperate regions primarily for showy ornamentals, the Acanthaceae are the 11th largest family of flowering plants (with more than 4,000 species) and a prominent element of many tropical regions. Mexico and Central America comprise a major center of diversity for this family.

Rosielyn (Rose) De Guzman
Curatorial Assistant, Botany, and Research Assistant, Geology

I came to the Academy as a volunteer in 2016 in the Geology Department. Now, I split my time working as a Research Assistant for Geology and a Curatorial Assistant in Botany. Some of my duties include collections care, data cleaning, digitization, loan processing, volunteer management, and assisting visiting researchers. I have a B.S. from UC Davis in Wildlife, Fish and Conservation Biology with a minor in Environmental Toxicology. Recently, I graduated from San Jose State University's Master of Library and Information Science program.

Sarah Jacobs - Assistant Curator of Botany and Howell Chair of Western North American Botany
Assistant Curator of Botany and Howell Chair of Western North American Botany

As a curator in the Botany Department at the California Academy of Sciences, Dr. Sarah Jacobs is part of a core team of scientists that collectively curates the Academy’s collection of over 2.3 million herbarium specimens. As the Howell Chair of Western North American Botany, she is particularly focused on guiding and shaping the collection of Western North American plants, ensuring their preservation, growth, and relevance into the future.

Maia Jones, Botany
Research Assistant, Botany

I am a research assistant in the Nagalingum lab in the Botany department. My current research project is on cycads from South Africa in the genus Encephalartos (Zamiaceae). Many of the species from this region are functionally extinct in the wild or critically endangered, so we are using genomic data to assess the genetic diversity of these species in order to inform ex situ conservation efforts. My previous research projects with Dr. Nagalingum focused on Malaysian fern phylogenetics, and population genetics of an Australian cycad, Cycas candida (Cycadaceae).

Curatorial Assistant, Botany
Dr. Manuel Luján
John J. Rose Postdoctoral Fellow (former), Botany

Documenting the world's vast plant diversity has been one of the most challenging endeavors in the natural sciences. Inspired by the exuberant tropical plant diversity, my research interests started with floristic projects on cloud forests and tropical wet forest relicts in Venezuela. I have studied species diversity and taxonomy of the giant genus Croton (Euphorbiaceae) and participated in collaborative projects on the systematics of the diverse genus Ruellia (Acanthaceae).

Emily Magnaghi
Collection Manager, Botany

My time in the Botany department at the Cal Academy spans my graduate and curatorial assistant work from 2005-2011 and my return in 2018 to present. I studied the taxonomy of Paleotropical Mendoncia (Acanthaceae) for my MS degree and was lucky enough to travel to Madagascar twice. Now, I manage the collection and look forward to the challenging yet fulfilling work ahead with our great team.

Dr. Heritiana Ranarivelo
Research Associate, Botany
Systematics, Biogeography, Taxonomy, Malagasy flora

My research interests focus on the taxonomy, systematics and biogeography of the Malagasy flora. I am conducting ongoing research on the St. John’s wort family, Hypericaceae, and the princess flower family, Melastomataceae, and am also investigating the relationships between Malagasy species and closely related groups from mainland Africa and the New World.