Howard Samuel Irwin

Senna obtusifolia, known by common names including Chinese senna, American sicklepod and sicklepod, is a plant in the genus Senna, sometimes separated in the monotypic genus Diallobus. It grows wild in North, Central, and South America, Asia, Africa, and Oceania, and is considered a particularly problematic weed in many places. It has a long-standing history of confusion with Senna tora and that taxon in many sources actually refers to the present species. In the traditional medicine of Eastern Asia, the seeds are called jué míng zǐ in Chinese (simplified: 决明子; traditional: 決明子),

Senna siamea, also known as Siamese cassia, kassod tree, cassod tree and cassia tree, is a legume in the subfamily Caesalpinioideae. It is native to South and Southeast Asia, although its exact origin is unknown.

Senna spectabilis is a plant species of the legume family (Fabaceae) in the subfamily Caesalpinioideae native to South and Central America. They are often grown as an ornamental in front yards, parks, gardens, buildings etc. due to their bright yellow flowers that bloom during the summer months. They are also known as golden wonder tree, American cassia, popcorn tree, Cassia excelsa, golden shower tree or Archibald's cassia. The plant has become an invasive alien species in parts of Africa such as Kenya, Malawi, Tanzania and Uganda, and also in South-India, after it was introduced for

Senna didymobotrya is a species of flowering plant in the legume family known by the common names African senna, popcorn senna, candelabra tree, and peanut butter cassia. It is native to Africa, where it can be found across the continent in several types of habitats. It has been introduced to many other parts of the world for use as an ornamental plant, a cover crop, and a leguminous green manure. In some places it is now naturalized in the wild, for example, in parts of Indonesia, Australia, Mexico, and the United States in California, Florida, and Hawaii.

Senna surattensis, also called glossy shower, scrambled egg tree, glossy shower, golden Senna, glaucous Cassia, sunshine tree and bushy Cassia, is a plant species of the legume family (Fabaceae) in the subfamily Caesalpinioideae that is native to southeast Asia, and possibly northern and eastern Australia. S. surattensis is named after Surat district, situated near Bombay, India.

Senna corymbosa is an ornamental plant in the genus Senna. It is also known as Argentine senna, Argentina senna, buttercup bush, flowering senna, Texas flowery senna or tree senna.

Senna septemtrionalis, commonly known as arsenic bush, is a species of flowering plant in the family Fabaceae and is native to Central America, the southern United States and Mexico, but is naturalised in many other countries. It is an erect shrub with pinnate leaves, with four or five pairs of egg-shaped leaflets, and yellow flowers arranged in groups of five to eight, usually with seven fertile stamens and four staminodes in each flower.

Senna pendula, also known as Easter Cassia, Christmas Senna, winter Senna, climbing Cassia, golden shower, pendant Senna and valamuerto, is a plant of the Fabaceae family with a shrub habit that is native to South America. It used in various parts of the world as an ornamental plant and is an environmental weed in Australia. The flowers are yellow and the name pendula means 'pendulous' or 'drooping'.

Chamaecrista absus (syn. Cassia absus), the pig's senna or tropical sensitive pea, is a species of flowering plant in the family Fabaceae, with a worldwide distribution in the tropics and subtropics. An annual herb reaching 60 cm (24 in), it is a common weed of cultivated and waste places, and its seeds are regularly harvested and sold for use in traditional medicine in Africa and Asia.

Senna multiglandulosa, commonly known as glandular senna, downy senna, or buttercup bush is a species of flowering plant in the family Fabaceae and is native to Mexico, Guatemala, and western parts of South America. It is a shrub with pinnate leaves, usually with six to eight pairs of linear to lance-shaped leaflets, and yellow flowers arranged in groups of ten to twenty, with seven fertile stamens in each flower. It is widely cultivated as an ornamental plant and in some areas of the world has become naturalized.

Senna hirsuta, commonly known as woolly senna, is a species of flowering plant in the family Fabaceae and is native to Central and South America, but is naturalised in many other countries. It is an erect or spreading shrub or herbaceous perennial with pinnate leaves, with two to six pairs of egg-shaped leaflets, and yellow flowers arranged in groups of two to six, with six fertile stamens and four staminodes in each flower.

Senna hebecarpa, with the common names American senna and wild senna, is a species of legume native to eastern North America.

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Senna wislizeni, commonly called Wislizenus' senna or shrubby senna (formerly "cassia", but this generally refers to larger Cassiinae), is a species of legume. Formerly in the wastebin taxon Cassia sensu lato, it is now placed in the genus Senna or sometimes separated in Palmerocassia together with Senna unijuga. This is a perennial, deciduous shrub native to Chihuahua and Hidalgo in Mexico; and Texas, New Mexico, and Arizona in the U.S. It is a desert plant with good heat and drought tolerance. Senna wislizeni can reach ten feet (3.0 meters) tall with a ten-foot spread. It has compound

Senna reticulata, the mangerioba grande or maria mole in Portuguese, is a pioneer tree species found on highly fertile floodplains in South America. It has some medicinal uses, but is regarded by farmers as a noxious weed, named matapasto (meadow killer) due to its ability to grow fast and outshade neighbouring plants.

Senna gaudichaudii, also known by many common names, including kolomana in Hawaii and as blunt-leaved senna in Australia, is a species of flowering plant in the family Fabaceae. It is native to some Pacific Islands including Hawaii, parts of Southeast Asia and Queensland in Australia. It is a shrub or small tree with pinnate leaves, usually with three to five pairs of oblong to egg-shaped leaflets, and yellow flowers arranged in groups of four to ten, with ten fertile stamens in each flower.

Senna domingensis is a flowering plant species in the legume family (Fabaceae). It is a threatened species, found in Cuba, the Dominican Republic, and Haiti.

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Senna macranthera is a tree in the family of Fabaceae. With a height of 6 to 9 m, it has an abundance of yellow flowers from December to April in its homelands.

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Senna covesii (desert senna, Coues' senna, rattleweed, rattlebox, dais, or cove senna) is a perennial subshrub in the family Fabaceae, native to the Mojave Desert and Sonoran Desert in southeastern California, southern Nevada, and Arizona in the United States, and northern Baja California in Mexico. It is found on desert plains and in sandy washes between 300 and 900 m above sea level, and is very common in Joshua Tree National Park. The specific epithet honors ornithologist Elliott Coues. It grows to 30–60 cm tall, and is leafless most of the year. The leaves are pinnate, 3–7 cm long, with

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Senna bauhinioides, the twinleaf senna, is a species of flowering plant in the family Fabaceae. It is native to the US states of Arizona, New Mexico, and Texas, and to northern Mexico, and it has been introduced to the US state of Maryland. An opportunistic species, it is unpalatable to livestock, so its presence is considered an indicator of overgrazing.

Senna atomaria, the flor de San Jose, is a species of flowering plant in the family Fabaceae, native to Mexico, Central America, the Caribbean, Colombia, and Venezuela. A shrub or small tree, it is considered a multi-purpose species; fuel, wood, biomass, soil improvement, medicine, and ornament.

Senna armata is a species of flowering plant in the legume family known by the common names spiny senna and desert senna. It is native to the desert regions around the intersection of Nevada, Arizona, eastern California and northern Baja California, where it grows in sandy and rocky habitat, such as arroyos. It is a shrub growing up to a meter tall, its grooved, branching stems often narrowing to thorns at their tips. The spiny branches are coated in tubular hairs which help protect it from hot desert air. The spine-tipped leaves are each made up of two to four pairs of small leaflets. The

Chamaecrista bucherae is a species of flowering plant in the plant family Fabaceae. This shrub rarely attains the size of a small tree. It is confined to coastal lowland. It is in danger of extinction because of degrading land. It is found only in Cuba.

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Senna uniflora, the oneleaf senna, is a species of flowering plant in the family Fabaceae. It is native to Mexico, Central America, the Caribbean, Colombia, Venezuela, and most of Brazil, and has been introduced to India, Mauritius, and Réunion. Although it is somewhat weedy and invasive, it is used to out-compete the pernicious weed Parthenium hysterophorus.