From Common Forest Trees of Hawaii

Common Guava
Psidium guajava
Eucalyptus-Like family (Myrtaceae)

Post-Cook introduction

Guava is an shrub or small tree cultivated for its rounded yellow edible and widely naturalized as a weed tree in lowland thickets. It differs from strawberry guava (Psidium cattleianum), in the larger flowers, larger yellow and in thinner leaves with many sunken parallel side veins.

©2013 Anita Gould
Shrub or small tree to 30 ft (9 ) high, with trunk to 8 inches (0.2 ) in diameter and widely spreading Bark brown, smooth, thin, peeling off in thin sheets, exposing greenish brown inner layers. Inner bark is brown, slightly bitter. Twigs four-angled and slightly winged when young, hairy and green, becoming brown.

Leaves with short broad leaf-stalks of 1⁄8– 1⁄4 inch (3–6 ). Blades oblong or elliptical, 2–4 inches (5–10 ) long and 1–2 inches (2.5–5 ) wide, short-pointed or rounded at both ends, slightly thickened and leathery, with edges a little turned under. Upper surface green or yellow green, dull or slightly shiny, almost hairless at maturity, with many sunken parallel side veins, and lower surface paler, finely hairy, with side veins raised, and with tiny -dots visible under a lens.

Flowers mostly single, sometimes 2–4, scattered at leaf bases on stalks of 3⁄4–1 inch (2–25 ), white, fragrant, about 1 1⁄2 inches (4 ) across. The green finely hairy tubular base () 3⁄8 inch (10 ) long and broad encloses the and bears other parts; of 4–5 yellow green rounded, slightly thickened, finely hairy 3⁄8–5⁄8 inch (10-15 ) long, which remain at top of 4–5 elliptical rounded white petals 5⁄8–3⁄4 inch (15–19 ) long; very many spreading threadlike white and with inferior 4–5-celled and slender white

(berries) are rounded or sometimes pear-shaped, yellow, 1 1⁄4–2 inches (3–5 ) in diameter and as much as 3 inches (7.5 ) long, smooth or slightly rough, with 4–5 at with strong mellow odor at maturity, edible. Outer layer thin, yellow, slightly sour or sweet, and juicy pinkish or yellow pulp. Seeds are many, elliptical, more than 1⁄8 inch (3 ) long, yellow. Sapwood light brown, heartwood reddish brown.

The hard, strong, heavy wood ( gr. 0.8) has been used for tool handles, implements, and charcoal. Elsewhere, the bark has been employed in tanning. Extracts from leaves, bark, roots, and buds have served in folk medicine. Hawaiians made a medicinal tea from leaf buds.

Commonly cultivated through the tropics for the which are unusually rich in vitamin C. can be eaten raw, although the pulp is many seeded. Guava paste, jelly, preserves, and juice are prepared from the fresh and guava powder from dehydrated

Several horticultural varieties have been named. Hawaiians distinguished a few by their according to Neal: kuawa-lemi or lemon guava with pink pulp; kuawa-ke‘oke‘o with whitish pulp; and kuawea-momona with larger seeds, sweet pink pulp, and thicker skin. Guava plants are propagated by root and stem cuttings. They begin to bear at 3–4 years, are best at 15–25, and die at about 50.

Guava was introduced into Hawaii early in the 19th century, apparently by Don Marin. The oriental and Mediterranean flies and melon flies, which infest about half of the came later.

In Hawaii, guava is planted and abundantly naturalized through the islands. Classed as an undesirable weed in pastures, rangelands, and waste places. More than a century ago, Hillebrand (1888, p. 130), who left Hawaii in 1871, noted that guava had “spread over many parts of the islands, in some valleys forming close thickets, to the exclusion of every other shrub or tree.”

The seeds are scattered by cattle, wild hogs, and birds. Guava thickets in pastures destroy forage plants. Eradication is difficult because of root sprouts. In the late 1800s firewood gatherers on the windward side of Oahu were stopped from cutting guava, the principal fuelwood, because the cutting caused extensive root sprouting and spread of the plants in pastures.

Special areas
Kokee, Waimea Arboretum, Wahiawa, Aiea, Tantalus

Native of tropical America, probably from southern Mexico to South America, the range greatly extended through cultivation in tropical and subtropical regions of the world. Naturalized in southern Florida and Puerto Rico and Virgin Islands, and planted in California.

Other common names
common guava; guayaba (Puerto Rico, Spanish); abas (Guam); apas (N. Marianas); guabang (Palau); abas (Yap); guahva (Pohnpei)

An evergreen tree retains a large portion of its green leaves all year.

stamen -- the pollen-producing reproductive organ of a flower; The stamen consists of an anther supported by a filament.

style -- This is a long and thread-like structure that connects the stigma with the ovary. A flower may have a single style, or several of them.

sp. -- The abbreviation for "species". The plural is "spp". When used it sometimes means that the exact species is unknown. For example, "Aster sp" would mean some species within the Aster genus but the writer may not know exactly which species.

cm -- A centimeter which is about 0.4 inches.

In an opposite leaf arrangement the leaves come in pairs with one leaf on each side of a stem.

mm -- millimeter. About 1/25th of an inch.

The hypanthium or floral cup is a cup-like structure formed by the fused bases of the stamens, petals, and sepals.

m -- A meter is about 10% larger than a yard.

A pistil is the female structure of many flowers. It contains one or more carpels. Each carpel contins an ovary, style and stigma. The stigma receives the pollen which grows thru the style to reach the ovary.

Glands are plant structures that secrete liquids, salts or other substances. Glands often appear as hairs with a drop of liquid at the end.

calyx -- the sepals of a flower, typically forming a whorl that encloses the petals and forms a protective layer around a flower in bud.

fruit -- any seed-bearing structure in flowering plants. It is formed from the ovary after flowering.

lobe -- Rounded parts of a leaf (or other organ). Lobes bulge out about 1/4 of the leaf diameter.

canopy -- The foliage of a tree; the crown. Also the upper layer of a forest.

An ovary is a part of the female reproductive organ of the flower. Above the ovary is the style and the stigma, which is where the pollen lands and germinates to grow down through the style to the ovary.

The apex is the tip or the furthest point from the attachment.