Scientific Name – Flourensia cernua DC.
Common name(s) – tarbush, blackbrush, varnishbush, hojasé, Yerba del Hule.
Distribution and Habitat – common (endemic) on dry plains to the Chihuahuan Desert, Arizona, California, New Mexico and Texas at elevation ranging from 400-2000 m. Is associated with Hilaria mutica, Larrea tridentate, Prosopis sp., Scleropogon brevifolius. It is found in limestone or calcareous, deeper soils.
Description – deciduous shrub, erect to procumbent, 30 -200 cm tall, much branched. Twig light brown, gray, slender, resinous, pubescent; trunk gray to dark gray, glabrous, sparingly striate, resinous. Leaves alternate, simple, elliptical or oblong to oval, 1.6-2.5 x 0.6-1.2 cm, acute, margins entire, adaxially green and glabrous, abaxially paller and glabrous or pubescent, veins often black; petioles 1-2.5 mm long, puberulent. Inflorescences small, solitary. Flowers with 3 series bracts; bracts linear; ray flowers absent; disk flower 12-20, yellow, resinous. Flowering in July to December. Fruit achene, 0.5-1 cm long, oblong, compressed, villous; papus of 2-4 unequal bristles, 2.5-3.3 mm long.
Growth rate – slow
Requirements – prefers heavy, deep soils; full sun, light water.
Propagation – by seeds.
Properties and Uses – mature fruit is poisonous to sheep and goats. In Mexic, an infusion of the leaves is drunk frequently to treat various gastrointestinal ailments.
Curiosity – the genus Flourensia, tribe Heliantheae, consist of 32 species of resinous shrubs that grow from southern United States south to Argentina and Chile.
A.Powell – Trees and Shrubs of the Trans-Pecos and adjacent areas- University of Texas Press, 1998
James Stubbendieck, Stephan L. Hatch, L.M. Landholt – North American Wildland Plants – University of Nebraska Press, 2003
Mahendra Rai, Maria Cecilia Carpinella – Naturally Occuring Bioactive Compounds- Elsevier Science, 2006
Trees and shrubs
Deciduu or semi-evergreen shrub, prostrat, 50-150 cm tall and 1.2-1.8 m wide, often branched, with horizontal branches. Buds are pink opening spring. Suborbiculare or elliptical leaves, glossy dark green. The flowers are pink, small, almost Sesi, 1-2, anther white blooms in May-June, attracting bees.
Ceiba pentandra - tree, native of tropical America, seen as a species cultivated in the Philippines, growing in arid regions,forests and grasslands from sea level to 1000 m altitude.
Small tree, stem 6 m tall, thin. Lujerii are pubescent. Leaves with Lamine obovata, 9-19 x 3.5-5.5 cm, short top acuminata, the acute subcoriacee, subglabra mid rib, ribs side 10-13 pairs, petiole 3.5-10 mm, slightly pubescent.
Ilex aquifolium is a shrub native to Britain, 8 meters high. Crown dense pyramid. Bark is smooth, gray, alternate leaves, coriacee, ovat-elliptical or pointed spinal rigid, acute, those tricky steps and with the lower branches of the PA wave the upper branches, evergreen, bright green, toxic.
Angophora hispida Blaxell
Shrub or small tree, 4-5 m high. Gray-red bark at first smooth, exfoliating in due course. Leaves opposite, Sesia or short stalks, cordiform, 5-10 x 2.5-4.5 cm, pale green, pubescent. 3.7 flowers in a corymb, 10-15 cm diameter. Sepa free (dialisepal), green, petals free (dialipetal), white cream. Blooming in January. Fruit capsule.
Tussilago windbag - coltsfoot
From the Latin Tussilago tussis = cough on the plant's medicinal properties, windbag is the old name of poplar because of similarities between these species leaves.
Windbag Tussilago Tussilago is the only species of the genus.
Dioscorides, used potbal leaves as a substitute for tobacco, and to treat cough and asthma.
Buxus sempervirens - evergreen shrub, native of northern Africa, Asia and Europe, up to 800 m altitude. Increases in rare deciduous forests on limestone substrates in sunny exhibition, in association with integerrimus Cotoneaster, Pyrus pyraster, Prunus spinosa and Amelanchier rotundifolia.
Helleborus viridis - originating in Spain, France, Italy and Switzerland; grows on calcareous soils from 0 to 1700 m altitude, to the edges of deciduous forests, beech forests and mixed forests, grows in association with Arum dioscoridis, Crocus sp., Cyclamen coum, Fritillaria sp. Hyacinthus orientalis.
Evergreen tree, 15-20 m high. Leaves simple, alternate, coriacee, limb oval edge gear, 2.5-5 cm long, short stalks. Flowers arranged in dense corymb, hermaphrodite, pentamere, white, 1.5 cm in diameter, calyx of 5 SEPA. Fruit capsule, containing 10-20 seeds.