Deskripsi Beberapa Famili Pohon Penting I

Summary

The lecture introduces eleven tree and plant families considered important in dendrology, emphasizing their growth forms, leaf arrangement, sap, distinguishing features, and economically useful species in Indonesia. The learning goal is for students to describe each family and recognize examples of useful species.

Families Discussed

1. Anacardiaceae (mango family)

Usually shrubs or trees with simple, alternate leaves and no stipules. Sap may initially be clear but darken when exposed to air. Sap from some species can irritate skin or cause blistering, so the lecturer advises caution. A distinguishing feature is a petiole that widens toward its base.

Examples and uses include:

• Mango (Mangifera indica) and cashew (Anacardium occidentale), valued for their fruit.
• Lannea grandis, valued for its wood and the traditional medicinal use of its bark.

2. Annonaceae (custard-apple and ylang-ylang family)

Includes lianas, shrubs, and trees. Leaves are simple and alternate, with no stipules or gummy sap. The bark is fibrous and tends to tear rather than break cleanly.

Examples include soursop (Annona muricata), sugar apple (Annona squamosa), and ylang-ylang (Cananga odorata). The lecture mentions fruit, rope-making, fragrant flowers, and the ceremonial use of ylang-ylang flowers.

3. Apocynaceae (including pulai and frangipani)

Members may be herbs, shrubs, trees, or lianas. Leaves are simple and may be whorled, opposite, or occasionally alternate. A key identifying combination is milky-white sap and the absence of stipules.

Examples include pulai (Alstonia scholaris), jelutung (Dyera species), frangipani (Plumeria), and alamanda. The lecture mentions timber, the traditional use of pulai bark for fever, jelutung latex, and ornamental flowers.

4. Araucariaceae (damar family)

Trees with simple, opposite or nearly opposite leaves, associated with higher-elevation habitats. When the trunk is wounded, resin can harden on contact with air to form copal.

Agathis is highlighted for its large, straight timber trees and valuable damar resin.

5. Bignoniaceae

Includes lianas and trees. Leaves may be simple or compound and are usually opposite. The family generally lacks stipules and gummy sap. A distinguishing feature is a small gland near the base of the petiole.

Examples include Catalpa and Tabebuia, which are valued for timber, and Spathodea, Kigelia, and Jacaranda, which are grown as ornamentals. The lecturer warns that Spathodea campanulata, despite its attractive flowers, can become invasive and dominate an area.

6. Burseraceae (canarium family)

Usually shrubs or trees with alternate, pinnately compound leaves. Sap may be clear or white, thickens as it dries, and can form resin with a distinctive smell. The petiole may be enlarged at both ends, giving it a barbell-like appearance.

Canarium is noted for its edible seeds, which are used in food, and for its timber.

7. Calophyllaceae (bintangur family)

Trees with simple, opposite leaves and sap that may be yellowish or clear. The lecturer explains that this group was formerly included within Clusiaceae but is now treated separately.

Bintangur is mentioned as a source of strong timber. The lecture also refers to an older claim about potential activity against HIV, while noting that the lecturer was unaware of subsequent research results.

8. Cannabaceae

Includes herbs, shrubs, and trees with simple, alternate leaves and stipules. Leaves may be asymmetrical at the base, and their veins are typically pinnate.

Celtis and Trema are mentioned for timber. Trema is described as a pioneer in open or disturbed areas. The lecture also discusses Cannabis sativa, including its traditional uses and the prohibition associated with misuse.

9. Casuarinaceae (casuarina family)

Trees with small, scale-like leaves arranged in whorls. The family is described as lacking stipules and gummy sap.

Their fine, needle-like appearance can be misleading: the apparent “needles” are slender twigs bearing tiny scale-like leaves, not pine-like needles. Examples include Casuarina equisetifolia and C. junghuhniana, found in coastal, lowland, and mountainous settings.

10. Chrysobalanaceae

Shrubs or trees with simple, alternate leaves, stipules, and no gummy sap. The lecturer identifies a pair of glands near the base of the leaf blade as a distinguishing feature.

Kolaka wood is mentioned as very hard and useful for construction.

11. Clusiaceae (mangosteen family)

Shrubs and trees with simple, opposite leaves. Sap is usually pale yellow or yellowish-white and exudes slowly when a stem is injured. The petiole widens at the base and may have wing-like structures.

Mangosteen (Garcinia mangostana) is highlighted as an important fruit, while Garcinia dulcis is noted as a wild fruit found in forests. The lecturer also mentions the possible medicinal value of mangosteen rind, including antioxidant and anti-inflammatory properties.

Suggested Study Method

The lecturer recommends making a comparison table or spreadsheet to help distinguish the families. Suggested columns include:

• Family name
• Leaf type
• Leaf arrangement
• Presence or absence of stipules
• Sap characteristics
• Distinguishing features
• Important species and their uses

Comparing traits such as leaf arrangement, sap, stipules, and petiole shape can make family identification and review easier.

Speakers and Sources Featured

• Speaker: One lecturer, unnamed in the subtitles.
• Additional speakers or interviews: None identified. The lecturer refers to local practices and research claims, but no separate speakers or named sources are presented.