Shrubs Honor

Nature Study

Requirements

1. Find out the definition of a shrub and know where shrubs are most used.

   Answer: A SHRUB is a woody plant of small to medium size (generally 0.5 to 5 meters tall), without a defined main trunk, branching from the base — different from trees, which have a single trunk and grow taller. They are widely used in ornamental gardening, hedges, erosion control, shelter for wildlife, and fruit production (currant, raspberry). — Botanically, the distinction between a shrub and a tree is based on height (up to 5m vs. above 5m), trunk (multiple vs. single), and woody durability. Shrubs are essential in landscaping: roses, hydrangeas, azaleas, and camellias are classic examples. In erosion control, shrubs like Vetiver protect slopes with deep, dense roots on any terrain.

2. State 3 characteristics of shrubs that distinguish them from trees and herbs.

   Answer: 3 characteristics: 1) SIZE (shrubs are 0.5-5m tall, trees >5m, and herbs <0.5m); 2) TRUNK/STEM (shrubs have several woody branches coming from the base, trees have a single trunk, herbs have a non-woody herbaceous stem); 3) DURABILITY (shrubs and trees are perennial and woody, herbs are annual or biennial without real lignification). — The essential difference lies in lignification (formation of wood) and in the branching pattern. Shrubs and trees are perennial woody plants, but the shrub branches from the base (multi-stemmed), while the tree has a single trunk. Herbs (grasses, vegetables) do not develop wood and die at the end of the typical annual or biennial cycle.

3. Why is a grapevine sometimes considered a shrub?

   Answer: The grapevine (Vitis vinifera) is a woody climber that can be pruned and trained into a compact shape, without a single trunk, with several woody branches — characteristics that make it similar to a shrub. When grown in a low-pruning system (without tall support), it behaves more like a shrub than like a liana. — Technically the grapevine is a liana (a woody climbing plant), but in modern vineyards it is often trained in trellis or goblet-pruning systems where it takes on a shrubby form and size. The stems branching from the base and the annual lignification reinforce the dual classification — in John 15, Christ compares himself to the 'true vine'.

4. Give the name of a shrub that produces edible nuts.

   Answer: The HAZEL (Corylus avellana) is a shrub that produces edible nuts (hazelnuts). Native to Europe, it reaches 3-8 meters in height and is cultivated in Italy, Turkey, and the United States. Its hazelnuts are consumed raw, in chocolates (Nutella, Ferrero Rocher), and in fine pastry worldwide. — Turkey produces about 70% of the hazelnuts consumed in the world. The hazelnut is rich in vitamin E, magnesium, good fats, and plant protein. Another edible fruiting shrub is the pistachio (Pistacia vera), a shrub-treelet from the Middle East. The pecan and the walnut also come from trees (not shrubs) larger than hazels in nature.

5. Mention 2 cultivated and 2 wild shrubs in your area that produce showy flowers.

   Answer: CULTIVATED (gardening): 1) HIBISCUS (Hibiscus rosa-sinensis, large red flowers); 2) AZALEA (Rhododendron, pink, lilac, or white flowers in clusters). WILD (Brazil): 1) MANACÁ-DA-SERRA (Tibouchina mutabilis, white flowers that turn pink and purple); 2) QUARESMEIRA (Tibouchina granulosa, purple-violet flowers abundant during Lent). — The manacá-da-serra (Tibouchina mutabilis) is native to the Brazilian Atlantic Forest and unique in nature for producing flowers in three colors at the same time (white, pink, and purple). The glory bush (quaresmeira) blooms massively between March-April (Christian Lent, hence its name) and September-October. Hibiscus came from Asia but adapted perfectly to Brazil, with more than 200 varieties cultivated worldwide.

6. In which season of the year do most shrubs bloom? Give the name of a shrub that blooms before the leaves appear.

   Answer: 1) In which season do most shrubs bloom: in SPRING (between September and November in the southern hemisphere), when the mild climate and longer days stimulate flowering. 2) A shrub that blooms BEFORE the leaves appear: FORSYTHIA (Forsythia × intermedia), which covers itself in yellow flowers in late winter/early spring, before the foliage sprouts. — Forsythia, originating from China, is a symbol of the arrival of spring in the northern hemisphere — its bright yellow flowers appear on bare, dry branches, creating a striking contrast. Other shrubs that bloom before the leaves: ipê (some varieties, in Brazil), star magnolia, and Cornus mas. Pruning should be done right after flowering to preserve the buds.

7. Which parasitic shrub, widely used for indoor decoration, grows on the highest branches of different types of trees?

   Answer: It is MISTLETOE (Viscum album), a European hemiparasitic shrub that grows on the highest branches of trees such as apple trees, oaks, and lindens. Widely used in Christmas decorations (Christmas) — the English tradition of kissing under the mistletoe comes from ancient Celtic and Norse customs. Its leaves and white berries are mildly toxic if ingested. — Mistletoe is hemiparasitic: it performs photosynthesis (green leaves) but absorbs water and minerals from the host tree via haustoria (modified roots). Birds eat the white berries (Viscum album) and disperse the seeds along the high branches of host trees. In Brazil, there is the erva-de-passarinho (Phoradendron, Struthanthus), a native relative of European mistletoe.

8. From which shrubs do birds prefer to eat the fruits or seeds? Mention a shrub whose flower attracts birds.

   Answer: 1) Shrubs whose fruits/seeds birds prefer to eat: SURINAM CHERRY (pitangueira) (Eugenia uniflora) — red pitangas; WILD BLACKBERRY (amora-do-campo) (Rubus brasiliensis) — black berries; BRAZILIAN PEPPER TREE/PINK PEPPERCORN (aroeira-vermelha/pimenteira-brasileira) (Schinus terebinthifolius) — small reddish seeds highly sought after by birds. 2) A shrub whose FLOWER attracts birds: HIBISCUS (Hibiscus rosa-sinensis), whose tubular flowers rich in nectar attract hummingbirds; lantana (Lantana camara) also serves, attracting butterflies and birds. — Frugivorous birds (thrushes, tanagers, toucans) and granivorous birds (canaries, rufous-collared sparrows) seek fruits and seeds in shrubs. Hummingbirds are pollinators specialized in red/orange tubular flowers — hibiscus, abutilon, and yellow shrimp plant are classics. The pitangueira, native to Brazil, produces fruits frequently contested by thrushes and tanagers.

9. In which shrubs do birds prefer to build their nests?

   Answer: Birds prefer to build nests in dense, thorny shrubs that offer protection against predators: 1) SURINAM CHERRY (pitangueira) (dense branches); 2) ROSE BUSHES (thorns protect against cats and snakes); 3) HIBISCUS (dense foliage); 4) BRAZILIAN PEPPER TREE (aroeira-vermelhinha) (Schinus); 5) WILD BLACKBERRIES (amoreiras-do-campo). — The choice of shrub for nesting follows safety criteria: thorny branches (rose bushes, hawthorns) keep away felines and snakes; dense foliage (hibiscus, privet) provides camouflage for the eggs; multiple branching offers stable support for the nest. Some species choose shrubs near water. The great kiskadee (bem-te-vi) prefers trees; the rufous-bellied thrush (sabiá-laranjeira) prefers dense shrubs.

10. Gather, preserve, and correctly identify the flowers, leaves, seeds, seed pods, or branches with buds of 10 wild shrubs.

    Answer: You must collect from 10 wild shrubs in your region: flowers, leaves, seeds, seed pods, or twigs with buds. Preserve them in a botanical press (newspaper between boards with weight) for 2-3 weeks until completely dry. Glue them onto cardstock, identifying each one: common name, scientific name, date, and place of collection. Present the herbarium to the instructor. — The herbarium is an old scientific technique (16th century, Luca Ghini) — the largest in the world is that of the National Museum of Natural History in Paris (8 million specimens). For correct preservation: dry between papers under pressure, identify with a standard Linnaean label (scientific name in Latin, author, date, place, collector). It is the methodology of any beginning botanist in the world.