Question: Which plant grows further North, Zamia or Vallea?

Context paragraphs:
Salvia divinorum: Salvia divinorum (also known as sage of the diviners, ska maría pastora, seer's sage, yerba de la pastora and just salvia) is a psychoactive plant which can induce visions and other spiritual experiences. Its native habitat is in cloud forest in the isolated Sierra Mazateca of Oaxaca, Mexico, where it grows in shady and moist locations.  The plant grows to over a meter high, has hollow square stems, large leaves, and occasional white flowers with violet calyxes.  Botanists have not determined whether "Salvia divinorum" is a cultigen or a hybrid; native plants reproduce vegetatively, rarely producing viable seed.

Mendoncia velloziana: Mendoncia velloziana is a plant native to Atlantic Coast restingas vegetation which is an ecosystem of Atlantic Forest biome.  In addition, this plant grows either in Cerrado vegetation of Brazil.  This plant grows in following states of Brazil: Bahia, Ceará Minas Gerais Rio de Janeiro, São Paulo, Paraná and Santa Catarina, and it is usually visited by the hummingbirds.

Gaultheria nummularioides: "Gaultheria nummularioides" is a species of plant in the family Ericaceae.  It is distributed across India, Myanmar, Nepal, Bhutan, Indonesia, and Southwest China (Tibet, Yunnan, and Sichuan).  The plant grows in areas between 1,700 and 3,000 m above sea level, and grows better on rocky mountainsides and weed tree forests.  This species has been cultivated as an ornamental in Britain, the United States, and elsewhere for some decades.

Zamia: Zamia is a genus of cycad of the family Zamiaceae, native to Mexico, the West Indies, and Central and South America as far south as Bolivia.  The range of one species ("Z. integrifolia", extends into the contiguous United States, i.e. Georgia and Florida.

Carex stricta: Carex stricta is a species of sedge known by the common names upright sedge and tussock sedge.  It is grass-like and can be difficult to distinguish from other plants, because of its long, triangular, green stems.  The plant grows in moist marshes, forests and alongside bodies of water.  It grows up to 2 ft tall and 2 ft wide.  When the leaves die, they build on top of or around the living plant, making a "tussock".  It is one of the most common wetland sedges in eastern North America.

Sisymbrium altissimum: Sisymbrium altissimum is a species of "Sisymbrium".  The plant is native to the western part of the Mediterranean Basin in Europe and Northern Africa and is widely naturalized throughout most of the world, including all of North America.  It was probably introduced into North America by a contaminant crop seed.  The plant grows in soils of all textures, even sand.  The plant germinates in winter or early spring.  The blooming time is lengthy, and after maturity the plant forms a tumbleweed.  Common names of the plant include Jim Hill mustard, after James J. Hill, a Canadian-American railroad magnate, tall tumblemustard, tall mustard, tumble mustard, tumbleweed mustard, tall sisymbrium, and tall hedge mustard.

Vallea: Vallea is a genus of trees in the family Elaeocarpaceae.  Trees in this genus are native to the Andes mountain range in South America and are classified in two species:

Argemone albiflora: Argemone albiflora, the white prickly poppy, also known as the bluestem prickly poppy or the Texas prickly poppy, is a small erect plant with a decorative white flower with a yellow latex.  It is deeply rooted with yellow or red stamens.  The plant is known for the sharp prickles on its stem and leaves.  The sepals fall off as the flower of this plant grows bigger.  It grows in the arid regions of the southern Midwest along roadsides and disturbed pieces of land.  Native Americans have long revered this plant for its medicinal and other uses.

Chorizanthe watsonii: Chorizanthe watsonii is a species of flowering plant in the buckwheat family known by the common name fivetooth spineflower.  It is native to the western United States from Washington to the Mojave Desert.  It grows in many types of plant communities from desert scrub to woodland and sagebrush.  This small plant grows a woolly erect stem up to about 15 centimeters tall.  The inflorescence is a cluster of flowers surrounded by five hairy greenish bracts tipped with hooked awns.  The flower is about 2 millimeters wide and yellow in color.

Delphinium staphisagria: Delphinium staphisagria is a species of "Delphinium", or larkspur, of the family Ranunculaceae.  This plant is also known as Lice-Bane or Stavesacre.  It is described botanically as a stoutly-stemmed, hairy biennial with large palmate leaves up to 6 inches (15 cm) across.  The flowers are mauve-blue to blue, short-spurred, and up to 1 inch (2.5 cm) across, occurring in racemes.  The plant grows to a height of 4–5 feet.  It grows throughout the Mediterranean.  The dark-colored, wrinkled seeds of "D. staphisagria" are characteristically quite large (~5x6 mm), and it is likely that the species name, which translates to "wild raisin" (classical Greek: σταφὶς ἀγρία) is based on their appearance.  This name-derivation seems to have been arrived at independently by a modern horticulturalist, David Bassett, who also gives a detailed account of his experiences in growing this species.  All parts of this plant are highly toxic and should not be ingested in any quantity.

Supporting paragraphs: Zamia Vallea
Answer: Zamia