Augustin Saint-Hilaire
Encyclopedia
Botany
Botany, plant science, or plant biology is a branch of biology that involves the scientific study of plant life. Traditionally, botany also included the study of fungi, algae and viruses...
and traveler, was born at Orléans
Orléans
-Prehistory and Roman:Cenabum was a Gallic stronghold, one of the principal towns of the Carnutes tribe where the Druids held their annual assembly. It was conquered and destroyed by Julius Caesar in 52 BC, then rebuilt under the Roman Empire...
, France, on 4 October 1779. He began to publish memoir
Memoir
A memoir , is a literary genre, forming a subclass of autobiography – although the terms 'memoir' and 'autobiography' are almost interchangeable. Memoir is autobiographical writing, but not all autobiographical writing follows the criteria for memoir set out below...
s on botanical subjects at an early age. Between 1816 and 1822 and again in 1830, he traveled in South America, especially in south and central Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...
, and the results of his study of the rich flora of the regions through which he passed appeared in several books and numerous articles in scientific journals.
In his first voyage, from 1816 to 1822, he explored the Brazilian backlands, traveling ca. 9,000 km, from Northeast Brazil to Río de la Plata
Río de la Plata
The Río de la Plata —sometimes rendered River Plate in British English and the Commonwealth, and occasionally rendered [La] Plata River in other English-speaking countries—is the river and estuary formed by the confluence of the Uruguay River and the Paraná River on the border between Argentina and...
. He was able to gather 24,000 specimens of plants, with 6,000 species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...
, 2,000 birds, 16,000 insect
Insect
Insects are a class of living creatures within the arthropods that have a chitinous exoskeleton, a three-part body , three pairs of jointed legs, compound eyes, and two antennae...
s and 135 mammal
Mammal
Mammals are members of a class of air-breathing vertebrate animals characterised by the possession of endothermy, hair, three middle ear bones, and mammary glands functional in mothers with young...
s, plus many reptile
Reptile
Reptiles are members of a class of air-breathing, ectothermic vertebrates which are characterized by laying shelled eggs , and having skin covered in scales and/or scutes. They are tetrapods, either having four limbs or being descended from four-limbed ancestors...
s, mollusks and fish
Fish
Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...
es. Most of these species were described for the first time. In the next years he devoted himself to the study, classification, description and publication of this huge material, but he was considerably impaired by his ill health, due to diseases contracted during the tropical travels. In 1819 he was appointed correspondent of the Académie des Sciences. He was awarded the Légion d'honneur
Légion d'honneur
The Legion of Honour, or in full the National Order of the Legion of Honour is a French order established by Napoleon Bonaparte, First Consul of the Consulat which succeeded to the First Republic, on 19 May 1802...
at the level of Chevalier, and the Portuguese Order of Christ
Order of Christ
Order of Christ may refer to:* Order of Christ – former Knights Templar Order awarded initially by the kings of Portugal, now by the Portuguese state...
.
A keen observer, he is credited with important discoveries in botany, notably the direction of the radicle
Radicle
In botany, the radicle is the first part of a seedling to emerge from the seed during the process of germination. The radicle is the embryonic root of the plant, and grows downward in the soil...
in the embryo sac and the double point of attachment of certain ovule
Ovule
Ovule means "small egg". In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: The integument forming its outer layer, the nucellus , and the megaspore-derived female gametophyte in its center...
s. He also described two families, the Paronychiae and the Tamariscinae, as well as a large number of genera and species.
The works by which he is best known are the Flora Brasiliae Meridionalis in three volumes (1825–1832), published in conjunction with A. de Jussieu, and J. Cambessdes; Histoire des Plantes les plus Remarquables du Brésil et de Paraguay (1824), Plantes Usuélles des Brésiliens (1827–1828), also in conjunction with De Jussieu and Cambessdes; and Voyage Dans le District des Diamants et sur le littoral du Brésil, in two volumes (1833). His Leçons de Botanique, Comprénant Principalement la Morphologie Végetale (1840), was a comprehensive exposition of botanical morphology and of its application to systematic botany. He died at Orléans on 3 September 1853.
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