Plants named in 2003

Heliotropium arboreum is a species of flowering plant in the family Heliotropiaceae. It is native to tropical Asia including southern China, Madagascar, northern Australia, and most of the atolls and high islands of Micronesia and Polynesia. Common names include velvetleaf soldierbush, tree heliotrope, veloutier, and octopus bush. It is a shrub or small tree typical of littoral zones reaching a height of 3.6 m (12 ft), with a spread of about 5 m (16 ft).

Guarianthe, abbreviated Gur. in the horticultural trade, is a small genus of epiphytic orchids, growing in wet forests in Mexico, Central America, Colombia, Venezuela and Trinidad. It was separated from the bifoliate Cattleyas in 2003, based on phylogenetic studies of nuclear DNA sequence data.

Astrophytum caput-medusae (synonym Digitostigma caput-medusae) is a species of cactus native to Mexico.

Splachnales is an order of Bryophyta or leafy mosses. Along with Orthotrichales, Hedwigiales, and Bryales, it forms the superorder Bryananae.

Lamioideae is a subfamily of plants in the family Lamiaceae. Genera include:

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Kandelia obovata (Traditional Chinese: 水筆仔、秋茄樹) is a species of plant in the Rhizophoraceae family, i.e. a kind of mangrove. It is found in Vietnam, Natuna Islands of Indonesia, Southern China, Hong Kong, Taiwan, and Japan. Its presence in the Philippines is possible but not confirmed. The florescence period of this species is between May and July. The flowers of it are white and like a star. In Autumn, they usually fructify with cone-like fruits, and their seeds germinate while still attached to the parent tree. Once germinated, the seedling grows and forms a propagule (a seedling ready to

Yucca cernua E.L. Keith, common name "nodding Yucca," is a rare species in the family Asparagaceae known only from a small region in Newton and Jasper Counties in eastern Texas. The epithet "cernua" and the common name "nodding yucca" both refer to the plant's nodding flowers, i.e. appearing to hang with the center pointing downward. The species often grows in disturbed habitats such as roadsides.

Hedwigiales is an order of mosses. It is named after Johannes Hedwig (1730-1799), the founder of modern bryology.

Aloe bruynsii is a species of flowering plant in the family Asphodelaceae. It is endemic to Madagascar.

Quercus iltisii is a species of oak tree native to western Mexico, where it is found in a small portion of Jalisco and Colima states.

Quercus cualensis is a rare species of oak. It has been found only in a small region in the State of Jalisco in western Mexico, in the Sierra el Cuale mountains south of Puerto Vallarta.

Disocactus ackermannii commonly called red orchid cactus is an epiphytic cactus from tropical forests in the states of Veracruz and Oaxaca, Mexico. In cultivation, it has been confused with Disocactus × jenkinsonii, a hybrid between D. phyllanthoides and D. speciosus.

Allium azutavicum is a rare plant species endemic to Kazakhstan.

Acianthera magalhanesii is a species of orchid. It is originally from Mines Gerais and Bahia, Brazil. It belongs to the section Sicaria.

Acer yangbiense is a species of maple with a very restricted distribution in Yunnan, China, only known from around ten specimens from a single locality on the western slope of Mount Cangshan in Yangbi County. Acer yangbiense is a deciduous tree up to 20 metres (66 ft) in height with noticeably pubescent new branchlets. The leaves are five-lobed and large, up to 20 cm long and 25 cm across, again with clear pubescence on the veins on the underside of the leaves.

Viola banksii, commonly known as native violet, is sold and grown throughout garden nurseries and grown and loved in gardens around Australia, especially in the east. For many years it was known as Viola hederacea, however, the species complex was revised in 2004 by Kevin Thiele, with the name Viola banksii being published in 2003 by Kevin Thiele and Suzanne Prober. Although the Native Violet was initially collected by Banks and Solander, the type specimen was either lost or not provided until a collection by Jacques Labillardière in Tasmania. Thiele discovered that the original type specimen

Zygophyllum fontanesii, synonym Tetraena fontanesii, is a species of plant of the family Zygophyllaceae. It is found in Macaronesia and northwest Africa.

Zygophyllum album (synonym Tetraena alba) is a species of plant in the family Zygophyllaceae which is found in arid regions of Africa and the Arabian Peninsula. It is a salt tolerant plant and dominates many of the plant communities in which it grows.

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Schoenoplectiella is a genus of flowering plants in the sedge family. It has a nearly-cosmopolitan distribution. The genus was first described in 2003 by Kaare Arnstein Lye, and the type species is Schoenoplectiella articulata. There are no synonyms.

Pseudorhipsalis amazonica is a species of Pseudorhipsalis found in Costa Rica, Panama, Brazil, Colombia, Ecuador, Peru, and Venezuela

Nepenthes saranganiensis (; "from Sarangani") is a tropical pitcher plant native to the Philippine island of Mindanao. It is noted for its extremely decurrent leaf attachment that extends a large distance down the stem, often continuing into the next internode. Nepenthes saranganiensis belongs to the informal "N. alata group", which also includes N. alata, N. ceciliae, N. copelandii, N. extincta, N. graciliflora, N. hamiguitanensis, N. kitanglad, N. kurata, N. leyte, N. mindanaoensis, N. negros, N. ramos, and N. ultra. These species are united by a number of morphological characters,

Nepenthes izumiae is a tropical pitcher plant endemic to Sumatra, where it grows in montane forest at 1,700–1,900 m above sea level. It appears to be most closely related to N. lingulata and N. singalana. The specific epithet izumiae honours Izumi Davis, wife of Troy Davis, one of the describing authors.

Nepenthes hurrelliana (synonymous with Nepenthes mollis) is a tropical pitcher plant endemic to Borneo, where it has been recorded from northern Sarawak, southwestern Sabah, and Brunei. It is of putative hybrid origin; its two original parent species are thought to be N. fusca and N. veitchii. A thick indumentum of rusty-brown hairs covers the entire plant, a characteristic presumably inherited from the latter.

Etlingera coccinea is a monocotyledonous species of flowering plant in the Zingiberaceae family, which is the ginger family. This plant is known for its strikingly beautiful and vivid red flowers that was first described by Carl Ludwig von Blume, and given its current name by S. Sakai and Hidetoshi Nagamasu. Etlingera coccinea is part of the genus Etlingera and the family Zingiberaceae. No subspecies are listed in the Catalog of Life. Etlingera coccinea is native to Southeast Asia, including countries like Malaysia, Indonesia, and Thailand. It typically grows in tropical forests, thriving in

Bajacalia is a genus of three flowering plants in the family Asteraceae. The genus was erected in 2003 to house two species moved from genus Porophyllum, now named Bajacalia tridentata and B. crassifolia. The third was newly described at the time and named Bajacalia moranii. These plants are near-endemic to the Baja California peninsula in Mexico (States of Baja California and Baja California Sur); one species (B. crassifolia) also has been found on Tiburón Island, part of Sonora. They have succulent leaves and yellow flowers.

Acianthera teres is a species of orchid.

Acianthera serpentula is a species of orchid. It is native to the South American Atlantic Forest. The species was first described by João Barbosa Rodrigues in 1877, who originally named it Pleurothallis punctata, before renaming it to Pleurothallis serpentula in 1882. It was transferred to the genus Acianthera by Fábio de Barros in 2003. A. serpentula is distinguished from other plants in its genus by "the shape of its oblong, slightly pandurate lip".

Acianthera oligantha is a species of orchid.