Croton is an extensive flowering plant genus in the spurge family, Euphorbiaceae.
 The plants of this genus were described and introduced to Europeans by Georg Eberhard Rumphius.
 The common names for this genus are rushfoil and croton, but the latter also refers to "Codiaeum variegatum".
 The generic name comes from the Greek κρότος ("krótos "), which means "tick" and refers to the shape of the seeds of certain species.
The genus Artanema is a small group of flowering plant species in the Linderniaceae.
 It was formerly included in the Plantaginaceae, but reclassified based on genetic evidence.
The Croton River ( ) is a river in southern New York that begins where its eastern and western tributaries join downstream from the Croton Falls Reservoir.
 Shortly downstream, the Croton River, along with its tributary, the Muscoot River, flows into the Muscoot Reservoir, after which it empties into the New Croton Reservoir, which feeds the New Croton Aqueduct supplying water to New York City.
 Excess water leaves the spillway at the New Croton Dam, and finally empties into the Hudson River at Croton-on-Hudson, New York at Croton Point, about 30 mi north of New York City.
 The river has a watershed area of 361 sqmi .
Croton glandulosus has many common names such as vente conmigo, tooth-leaved croton, tropic croton and sand croton.
 It is part of the Euphorbiaceae family which is also known as the Spurge Family and it contains about 321 genera and 7,950 species.
 The family derives its name from Euphorbus who was a Trojan War hero in Greek mythology, and was also the Greek Physician of King Juba of Numidia.
 The genus, Croton, is derived from Greek, meaning “tick,” and this is because the seeds of the plant resemble a tick.
 The species, glandulosus gets its name from the gland like structures that appear at the end of the leaf stalk.
 Vente conmigo and various others species are found to be common weeds in gardens and lawns.
Calliphon of Croton (6th century BC) was a Pythagorean physician.
 He was apparently the chief priest at Croton and a man of great importance in civic affairs.
 Hermippus reports that he was an associate of Pythagoras, and he appears in Iamblichus's catalogue of Pythagoreans; thus he is one of the few Pythagoreans who can be dated from the time of Pythagoras.
 Josephus quotes Hermippus as saying that Pythagoras claimed that the soul of Calliphon of Croton used to remain at his side night and day, and that he used to utter the following advice: not to pass over a place where his donkey had stumbled, to drink only of clear fountain water, and to speak ill of no man.
 Herodotus, in telling the story of the physician Democedes of Croton, reports that Democedes was the son of Calliphon.
Croton ciliatoglandulifer, known as the bush croton or Mexican croton, is a plant species of the genus "Croton".
The Croton Falls Reservoir is a small reservoir in the Putnam County, New York townships of Carmel, and Southeast, roughly 50 mi north of New York City.
 A part of the Croton Watershed, it was formed by impounding the West Branch and Middle Branch of the Croton River, tributaries of the Croton River, which flows into the Hudson River.
Croton oil ("Crotonis oleum") is an oil prepared from the seeds of "Croton tiglium", a tree belonging to the order Euphorbiales and family Euphorbiaceae, and native or cultivated in India and the Malay Archipelago.
 Small doses taken internally cause diarrhea.
 Externally, the oil can cause irritation and swelling.
 Croton oil is used in some chemical peels, due to its caustic exfoliating effects it has on the skin.
 Used in conjunction with phenol solutions, it results in an intense reaction which leads to initial skin sloughing.
 Since croton oil is very irritating and painful, it is used in laboratory animals to study how pain works, pain-relieving and anti-inflammatory drugs, and immunology.
The Croton Aqueduct or Old Croton Aqueduct was a large and complex water distribution system constructed for New York City between 1837 and 1842.
 It was one of the first great modern aqueducts and transported water by the force of gravity alone 41 mi from the Croton River in Westchester County into reservoirs in Manhattan, where local water resources had become polluted and inadequate for the growing population of the city.
 Although the aqueduct was supplemented and largely superseded by the New Croton Aqueduct, which was built in 1890, the Old Croton Aqueduct remained in service until 1955.
Croton insularis known as the silver croton is a small tree in the spurge family.
 Growing in dry rainforest and rainforest margins in eastern Australia, north from the Blue Mountains.
 It is also found in New Caledonia and Vanuatu.
 Other common names include White Croton, Cascarilla, Native Cascarilla and Queensland Cascarilla.

Question: Croton and Artanema are both a what?
Answer: genus