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It reaches a height of 30 to 120 cm (12 to 47 in), leaves 4.0 to 7.5 cm (1.6 to 3.0 in) long and 2 to 5 cm (1 to 2 in) wide; ovate to heart-shaped, with wavy or large-toothed edges; both surfaces hairy or hairless; petiole 1 to 3 cm (0.5 to 1 in) long with a winged upper portion. The flowers have petals greenish to whitish, recurved when aged ...
The leaves are spread along the branches and have a nauseating stale-cabbage smell when crushed which helps distinguish it from Anopterus glandulosus (Escalloniaceae), which looks similar but lacks the smell and the leaves are often longer and arranged in false whorls. [9] The leaves turn black when dried. [9] [10] [11]
Leaves of most plants include a flat structure called the blade or lamina supported by a network of veins, a petiole and a leaf base; [1] but not all leaves are flat, some are cylindrical. [ citation needed ] Leaves may be simple, with a single leaf blade, or compound, with several leaflets .
Grevillea benthamiana is a shrub that typically grows to a height of 2–4 m (6 ft 7 in – 13 ft 1 in). Its leaves are bipinnate, 25–50 mm (0.98–1.97 in) long and 30–45 mm (1.2–1.8 in) wide in outline, and with 14 to 24 lobes that are further divided, the end lobes linear to narrow triangular, 3–10 mm (0.12–0.39 in) long and 0.7–1.0 mm (0.028–0.039 in) wide.
The leaves themselves are usually small – 2–4 cm long by 1–2 cm wide – but can grow up to 7 cm long. [3] The edges are undulated and the leaf shape can range from oval to almost circular. [4] Young leaves are covered in a layer of fine hairs that gets shed as the leaves grow. [3] Adult leaves have a smooth, glossy texture. [5]
Leaves are mostly green in color due to the presence of a compound called chlorophyll which is essential for photosynthesis as it absorbs light energy from the Sun. A leaf with lighter-colored or white patches or edges is called a variegated leaf. Leaves can have many different shapes, sizes, textures and colors.
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Black spot (class Leotiomycetes: family Helotiales) Diplocarpon rosae syn. Marssonina rosae – Marssonina rosae causes black spots on leaves. [4] The spots, which may be as much as 12 mm across, are generally circular and have an irregular edge often with a yellow halo. Leaves frequently turn yellow and fall early.