Silk oak (Grevillea robusta)

Pohon perak or silk oak (Grevillea robusta) is a species of plant in the Proteaceae, a large, fast-growing evergreen tree with one main trunk, 5-40 m tall, bark dark gray and wrinkled, grows in tropical mountains, rainforests subtropical, dry and wet rainforests.

G. robusta has fern-like leaves, 10-34 cm long, 9-15 cm wide and is divided between 11-31 major lobes and each lobe is sometimes further divided into 4 minor lobes, each linear to narrow triangular. The tree will lose a lot of leaves before flowering.

Flowers arranged on one side and sometimes branched with a length of 12-15 cm. The carpel of each flower has a stalk 21-28 mm long. Flowers are bare and mostly yellowish orange or reddish. Flowering in September-November and the following fruit are bald follicles.

Silk oak loves full sun and is drought tolerant. Flowers and fruit contain toxic hydrogen cyanide. Wood is widely used for joints outside windows, furniture, cabinets, fences, musical instruments and shade in plantations.

Kingdom: Plantae
Phylum: Tracheophyta
Subphylum: Angiospermae
Class: Magnoliopsida
Order: Proteales
Family: Proteaceae
Subfamily: Grevilleoideae
Tribe: Embothrieae
Subtribe: Hakeinae
Genus: Grevillea
Species: Grevillea robusta

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Tanglehead ( Heteropogon contortus ) is a species of Poaceae, an erect grass, up to 65 cm tall, with leaves up to 13 cm long and 0.5 cm wide. The inflorescence is at the top and hairy. The tip is black. This plant forms dense colonies in forests, agricultural lands, roadsides, and abandoned areas. TAXON : Kingdom: Plantae Phylum: Tracheophyta Subphylum: Angiospermae Class: Liliopsida Order: Poales Family: Poaceae Subfamily: Panicoideae Tribe: Andropogoneae Subtribe: Anthistiriinae Genus: Heteropogon Pers. in Syn. Pl. 2: 533 (1807) Species: Heteropogon contortus (L.) P.Beauv. in J.J.Roemer & J.A.Schultes, Syst. Veg., ed. 15[bis]. 2: 836 (1817) HOMOTYPIC SYNONYMS : Andropogon contortus L. in Sp. Pl.: 1045 (1753) Heteropogon contortus var. hirtus Hack. in C.F.P.von Martius & auct. suc. (eds.), Fl. Bras. 2(3): 267 (1883) Heteropogon hirtus Pers. (1807) Holcus contortus (L.) Stuck. in Anales Mus. Nac. Buenos Aires, ser. 3, 4: 48 (1904) Sorghum contortum (L.) Kuntze in Revis. Gen. ...

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