Question: Are Saguaro and Schinus both tree-like plants?

Context paragraphs:
Sigillaria: Sigillaria is a genus of extinct, spore-bearing, arborescent (tree-like) plants.  It was a lycopodiophyte, and is related to the lycopsids, or club-mosses, but even more closely to quillworts, as was its associate "Lepidodendron".

Schinus: Schinus is a genus of flowering trees and tall shrubs in the sumac family, Anacardiaceae.  Members of the genus are commonly known as pepper trees.  The Peruvian pepper tree ("Schinus molle") is the source of the spice known as pink peppercorns.  They can become serious invasive species outside their natural habitats. " Schinus polygama", although less well known, is also potentially weedy in some areas.

Lepidodendrales: Lepidodendrales (from Gr.  "scale tree") were primitive, vascular, arborescent (tree-like) plants related to the lycopsids (club mosses).  They thrived during the Carboniferous period, and some reached heights of over 30 meters, with trunks often more than one meter in diameter.  Sometimes called "giant club mosses", they are in fact more closely related to quillworts than to club mosses.

Calamitaceae: Calamitaceae is an extinct family of plants related to the modern horsetails.  Some members of this family attained tree-like stature during the Carboniferous Period (around ERROR!  Start of period Carboniferous unknown, perhaps because it was mis-spelt or because it is missing from . ) .  The family takes its name from its principal genus "Calamites".

Drosera gigantea: Drosera gigantea, the giant sundew, is an erect perennial tuberous species in the carnivorous plant genus "Drosera" that is endemic to Western Australia.  It grows in sandy soils at the margins of swamps and near granite outcrops along the Western Australian coast from Albany north to just south of Geraldton.  "D. gigantea" produces small shield-shaped leaves along many lateral branches that look like a small tree.  Individual plants can grow up to 0.2 - tall.  Because of its tall, tree-like form, it is considered one of the largest "Drosera" species.  It is also easily cultivated and enjoys damp, humid conditions often provided in greenhouses.  White flowers emerge from August to November.  The red tubers of this species can grow to be 3.8 cm in diameter and may be a metre below ground.

Peruphasma schultei: Peruphasma schultei is a species of stick insect found in the Cordillera del Condor region of northern Peru.  In the wild the insect feeds on "Schinus" plants, but will feed on privet and honeysuckle in captivity.  In Peru they are only known to exist in a region of less than 5 hectares, but since their discovery they have become increasingly popular as pets worldwide due to their unusual colouration and they are now bred regularly in captivity.

Archaeopteris: Archaeopteris is an extinct genus of tree-like plants with fern-like leaves.  A useful index fossil, this tree is found in strata dating from the Upper Devonian to Lower Carboniferous (ERROR!  Start of period Upper Devonian unknown, perhaps because it was mis-spelt or because it is missing from . ) , and has a global distribution.  The name derives from the ancient Greek ἀρχαῖος ("archaīos") meaning "ancient", and πτέρις ("ptéris"), meaning "fern".

Calamites: Calamites is a genus of extinct arborescent (tree-like) horsetails to which the modern horsetails (genus "Equisetum") are closely related.  Unlike their herbaceous modern cousins, these plants were medium-sized trees, growing to heights of more than 30 meters (100 feet).  They were components of the understories of coal swamps of the Carboniferous Period (around ERROR!  Start of period Carboniferous unknown, perhaps because it was mis-spelt or because it is missing from . ) .

Saguaro: The saguaro ( , ] ) (Carnegiea gigantea) is an arborescent (tree-like) cactus species in the monotypic genus Carnegiea, which can grow to be over 40 ft tall.  It is native to the Sonoran Desert in Arizona, the Mexican State of Sonora, and the Whipple Mountains and Imperial County areas of California.  The saguaro blossom is the state wildflower of Arizona.  Its scientific name is given in honor of Andrew Carnegie.  In 1994, Saguaro National Park, near Tucson, Arizona, was designated to help protect this species and its habitat.

Petrified wood: Petrified wood (from the Greek root "petro" meaning "rock" or "stone"; literally "wood turned into stone") is the name given to a special type of fossilized remains of terrestrial vegetation.  It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization.  All the organic materials have been replaced with minerals (mostly a silicate, such as quartz), while retaining the original structure of the stem tissue.  Unlike other types of fossils which are typically impressions or compressions, petrified wood is a three-dimensional representation of the original organic material.  The petrifaction process occurs underground, when wood becomes buried under sediment or volcanic ash and is initially preserved due to a lack of oxygen which inhibits aerobic decomposition.  Mineral-laden water flowing through the covering material deposits minerals in the plant's cells; as the plant's lignin and cellulose decay, a stone mold forms in its place.  The organic matter needs to become petrified before it decomposes completely.  A forest where such material has petrified becomes known as a petrified forest.

Supporting paragraphs: Saguaro Schinus
Answer: yes