Protea canaliculata Andrews

Growth Form

Protea canaliculata is a shrub that can grow up to 1.2 metres tall. Its branches are glabrous, red, and can be decumbent, somewhat decumbent, or upright.

Leaf Morphology

The linear, glabrous leaves are 13–18 cm (5–7 inches) long and only 1.6 to 3.2 mm wide, ending in a sharp to somewhat-sharp pointed tip. The leaves narrow at their bases and have indistinct veins.

Leaf Channel Trait

The upper surface of the leaf is concave, forming a distinct deep channel along the back of the leaf – this trait is the source of the species' specific epithet.

Flowering Period

This protea blooms in autumn and winter, from March to June, with peak flowering in May.

Inflorescence Size

The inflorescence is sessile, meaning it has no stalk. It grows 4.4 cm (1.75 inches) tall and 3.8 cm (1.5 inches) in diameter.

Outer Bract Characteristics

Nine series of bracts surround the flower head: the outer bracts are ovate with a rounded apex, covered in silky hairs, and have a hairy fringe (ciliate) along their margins.

Inner Bract Characteristics

The inner bracts are more oblong and concave, also ciliate, but have less silky hair; the innermost bracts are glabrous and the same length as the flowers.

Reproductive System

The species is monoecious, with both male and female reproductive structures present in each individual flower.

Fruit Traits

The fruits are woody and persistent, meaning they stay attached to the plant after the plant senesces.

Fire Response

Wildfires will destroy mature individuals, but the seeds survive fires, held in caps within the dried inflorescence. When seeds are released after a fire, they are dispersed by wind.

Endemic Range

This plant is endemic to the central region of the Western Cape province of South Africa. It occurs in the mountain ranges of the Little Karoo, from the Hex River Mountains to the Waboomsberg and Groot Swartberge, and also grows at Ouberg Pass in Western Cape.

Population Distribution

The species usually occurs in low densities as scattered plants across a wide area, but it may occasionally be found growing clustered together in dense stands.

Habitat Soil and Altitude

Ecologically, Protea canaliculata grows in rocky, open, quartzite- or sandstone-derived soils at altitudes ranging from 800 to 1,500 metres, or alternatively 700 to 1,700 metres.

Vegetation Habitat

It grows in montane fynbos habitat.

Pollinators

Pollination was originally thought to likely be carried out by birds, but both rodents and birds are now considered to pollinate this species.