Quizarrá Caca

The species entered science in 1889 as Nectandra sinuata, but modern Lauraceae specialists now place it in Ocotea. Burger and van der Werff describe it as a mid-elevation tree of seasonally dry forests on Costa Rica’s Pacific slope, extending to Santa María de Dota. The 2007 Manual de Plantas de Costa Rica also records the northern Valle del General.

Records extend north through Guatemala, El Salvador, Honduras, and southern Mexico, yet Costa Rica still hosts the densest documented stands. GBIF lists more than 550 collections overall, with clusters around Pérez Zeledón, San José, Cartago, and Puntarenas, plus historical trees near Turrialba that may date from planted windbreaks.

Identification

Leaves

Leaves are instantly recognizable by their velvety indument (covering of fine hairs). Blades measure 10–22(–30) × 3.5–12 cm, oblong-elliptic, with blunt or shortly pointed tips and bases ranging from blunt or truncated to rounded or shallowly heart-shaped. The upper surface is dark green and smooth, while the underside is densely clothed in tawny hairs 0.3–1 mm long. Petioles are 8–32 mm and equally pubescent (hairy).

Flowers

Inflorescences are large panicles up to 30 cm long with peduncles (main stalks) reaching 16 cm, all cloaked in golden-brown fuzz. Flowers are unusually large for the genus, 10–20 mm across, and often open pink or white before drying reddish-brown. The outer anthers have a connective (tissue connecting the anther halves) expanded into a petal-like flap, a distinctive trait that helped taxonomists recognize the species.

Fruits

Fruits mature into 2–2.5 cm ellipsoid drupes perched on large cupules (cup-like receptacles) about 16 mm across. The lower half of the cupule remains clothed in silky hairs even at maturity, making this one of the most recognizable Ocotea fruits in Central America.

Distribution and Habitat

The 2007 Manual de Plantas de Costa Rica records the species in humid, very humid and rain forests, usually at 600–1,900 meters and occasionally near sea level. The 1990 flora describes seasonally dry evergreen and partially deciduous forests at 300–1,500 meters; collections also extend above 2,400 meters. In Costa Rica it is most common in the Valle del General, Santa María de Dota, and the lower Pacific slopes of the Central Valley provinces. Burger and van der Werff also noted a few historical collections near Turrialba on the Caribbean slope that they considered possibly planted. Northward it follows the Pacific cordillera through Guatemala, El Salvador, Honduras, and Chiapas, where it reaches its highest densities.

Herbarium vouchers at UCR, INB, and MO often bear the label "quizarrá caca," noting that flowering peaks just before the first rains. Those annotations help survey crews distinguish the velvety leaves from sympatric Nectandra and track which populations along the Valle del General and Fila Costeña still produce seed. Flowering peaks during the dry season (January through April), providing nectar for bees and butterflies when few other laurels bloom. Fruits ripen as rains return, feeding motmots, toucans, and peccaries that disperse the large seeds into regenerating gaps.

A Chemical Arsenal

Few Costa Rican laurels have had their volatile chemistry studied as thoroughly as O. sinuata. Researchers at the Universidad de Costa Rica identified 88 distinct compounds from leaves, bark, and twigs collected near Monteverde. The leaf oil proved especially rich in sesquiterpenes: germacrene D dominated at 30.6%, followed closely by β-caryophyllene at 30.1%, with viridiflorol contributing another 8.9%. Bark samples showed a more balanced profile, with α-pinene (10.1%) and camphene (10.3%) rivaling the sesquiterpenes, while twig oil contained β-caryophyllene (18.4%), viridiflorol (11.3%), and caryophyllene oxide (8.7%).

These volatiles are more than taxonomy footnotes. β-caryophyllene functions as a chemical signal both above and below ground. Studies of responsive maize varieties show that rootworm damage can induce β-caryophyllene, attracting nematodes that infect the larvae. Damaged maize leaves can emit the same compound as a host-location cue for parasitoid wasps after they learn its association with caterpillars. Germacrene D adds its own defenses: laboratory tests confirm repellent activity against aphids and ticks, plus insecticidal effects on mosquitoes. These results suggest possible defensive roles for the compounds in O. sinuata, but whether the tree's mixture deters herbivores or attracts their natural enemies remains untested.

The common name "quizarrá caca" almost certainly derives from this volatile load. Crushing a leaf releases the sharp, resinous scent that herbarium collectors have noted for decades. Whether the name arose from the smell's intensity or its unflattering qualities, it serves as a useful field character: no other mid-elevation Pacific laurel produces quite the same aromatic punch when foliage is bruised.

Shade Coffee and the Pollinator Connection

The Valle del General, where O. sinuata reaches its Costa Rican stronghold, is also the heart of the country's southern coffee belt. Here the species persists not only in forest fragments but along windbreaks and inside traditional shade-grown plantations where farmers retain native trees for canopy cover. Research at one organic farm near San Vito in southern Costa Rica found higher bee diversity in plots with greater shade-canopy cover and more trees in flower.

Native bees dominated the surveyed pollinator communities. Bee diversity and visitation frequencies were higher at sites with greater shade-canopy cover and more trees in flower. When O. sinuata blooms from January through April, its large pink-white flowers provide nectar during the dry season lean period when few other laurels offer anything. The timing aligns with coffee flowering in the region, suggesting that wild bees shuttling between "quizarrá" and coffee may boost fruit set on both crops. Farmers have long known what ecologists are only now quantifying: keeping laurels in the shade canopy pays dividends beyond erosion control.

Conservation Outlook

The species' wide Central American range and tolerance of secondary forests keep it in the IUCN's Least Concern category, but local pressures remain. Coffee expansion and road building fragment forest habitat on the mid-elevation Pacific slope. Yet this tree has also been recorded flowering and fruiting in pasture. Conservation efforts focus on protecting riparian buffers along the Río Savegre and Río Térraba and encouraging landowners to keep standing "quizarrá" trees inside shade-grown coffee blocks.

Wildlife Connections

Seasonally dry forests that harbor O. sinuata still depend on toucans, magpie-jays, squirrels, and howler monkeys to move seeds. Keel-billed Toucans and White-throated Magpie-Jays gulp the silky fruits in the canopy, variegated squirrels have a general diet of fruits and seeds, and mantled howler monkeys carry seeds along riparian strips each dawn.

Photos (left to right, top to bottom): Keel-billed Toucan (Charles J. Sharp via Wikimedia Commons, CC BY-SA 4.0); White-throated Magpie-Jay (Charles J. Sharp via Wikimedia Commons, CC BY-SA 4.0); Variegated Squirrel (Bernard DUPONT via Flickr, CC BY-SA 2.0); Mantled Howler Monkey (Thomas Shahan via iNaturalist, CC BY-NC 4.0).

Taxonomic History

Carl Mez described this species in 1889 as Nectandra sinuata, placing it in a genus characterized by anthers with four pollen sacs arranged in an arc. His type specimen came from Guatemala. Nearly a century later, Jens G. Rohwer revised New World Lauraceae and transferred the species to Ocotea, a move reflecting updated understanding of anther structure and tepals (petal-like perianth segments) in these genera.

The epithet "sinuata" refers to the sinuate (wavy-edged) leaf margins. Burger and van der Werff's 1990 treatment in Fieldiana documents the Costa Rican distribution; the 2007 Manual de Plantas de Costa Rica records the common name "quizarrá caca," likely a reference to the strong scent of crushed foliage or bark. Despite its distinctive velvety leaves and large flowers, the species has attracted little focused research beyond floristic surveys.