Are  Syagrus and Ammobium both perennials?
no
Syagrus (plant)
Syagrus is a genus of Arecaceae (palms), native to South America, with one species endemic to the Lesser Antilles.
 The genus is closely related to the "Cocos", or coconut genus, and many "Syagrus" species produce edible seeds similar to the coconut.
Ammobium
Ammobium is genus of perennial Asteraceae species described as a genus in 1824.
Batrachedra nuciferae
Batrachedra nuciferae is a moth in the Batrachedridae family.
 It is found in Brazil.
 The larvae have been recorded feeding on "Attalea", "Cocos nucifera", and "Syagrus coronae". Syagrus coronata
Syagrus coronata, the Ouricury palm or licuri palm, is a species of palm tree that plays an important role in the diets of tropical seasonally dry forest animals.
 It is native to eastern Brazil, ranging from the southern part of the state of Pernambuco, into the state of Bahia, south to the Jequitinhonha River in the state of Minas Gerais. Syagrus sehranus
Syagrus sehranus is a species of leaf beetle from Algeria. Syagrus romanzoffiana
Syagrus romanzoffiana, the queen palm or cocos palm, is a palm native to South America, from Paraguay and northern Argentina (mostly Misiones Province) north to western Brazil and northern Uruguay and west to eastern Bolivia.
 It had been classified within the "Cocos" genus as "Cocos plumosa", was assigned to "Arecastrum", then moved to "Syagrus".
 As a result of the nomenclature confusion, they often retain a previous name in popular usage.
 Its transfer to Syagrus and the subsumation of Arecastrum may have been premature.
 A genetics team led by Bee F. Gunn found that S. romanzoffiana did not group with other Syuagrus species at all, but instead with Lytocarium weddellianum.
 S. romanzoffiana is a medium-sized palm, quickly reaching maturity at a height of up to 15 m tall, with pinnate leaves having as many as 494 leaflets, although more typically around 300, each leaflet being around 18 inches (45 cm) in length and 1-2 inches (2.5-5 cm) in width. Lytocaryum
Lytocaryum is a monoecious genus of flowering plant in the palm family endemic to Brazil where 4 species are known.
 Palms once classified as Microcoelum are herein included; the genus is closely related to "Syagrus", from which it is differentiated only by abundant tomentum, strongly versatile anthers, and slight epicarp, mesocarp, and endocarp differences.
 The name is Greek for "loose" and "nut". Syagrus (beetle)
Syagrus is a genus of leaf beetles (family Chrysomelidae) in the subfamily Eumolpinae.
 They are often attracted by plants in the family Malvaceae; "Syagrus rugifrons" and "Syagrus calcaratus" are pests of cotton.
 The larvae of "Syagrus calcaratus" attack the roots of the plant and cause it to wilt. Anchylorhynchus
Anchylorhynchus is a genus of weevils belonging the family Curculionidae and subfamily Curculioninae.
 It currently includes 22 described species distributed from Panama to Argentina.
 Members of the genus are pollinators of palms in the genera "Syagrus", "Oenocarpus" and "Butia", with adults living in inflorescences and larvae feeding on developing fruits.
 The first instar larvae of "Anchylorhynchus" have an unusual morphology, being specialized on killing other larvae infesting the palm fruits. El Palmar National Park
El Palmar National Park (in Spanish, "Parque Nacional El Palmar") is one of Argentina's national parks, located on the center-west of the province of Entre Ríos, midway between the cities of Colón (54 km) and Concordia (60 km).
 It has an area of about 85 km² and was created in 1966 for the preservation of its characteristic Yatay palm trees ("Syagrus yatay", formerly "Butia yatay", Arecaceae family).