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The top of the plant has one or more crowns of strap-shaped leaves that may be spiny, [2] [3] varying between species from 30 centimetres (12 inches) to 2 m (6 + 1 ⁄ 2 ft) or longer, and from 1.5 cm (5 ⁄ 8 in) up to 10 cm (4 in) broad. They are dioecious, with male and female flowers produced on different plants.
Present in all parts of the pineapple plant, [57] bromelain is a mixture of proteolytic enzymes. It is present in stem, fruit, crown, core, leaves of pineapple itself. [58] Bromelain is under preliminary research for treatment of a variety of clinical disorders, but has not been adequately defined for its effects in the human body. [59]
The crownshaft takes the form of a column above the main trunk and beneath the main crown of leaves and is nothing but the collection of the leaf bases of the plant, all tightly wrapped around one another. It is usually green in color but may be a different color from that of the leaves themselves, including white, blue, red, brownish or orange.
Eucomis autumnalis is a perennial growing from a large bulb with a diameter of up to 8–10 cm (3 + 1 ⁄ 4 –4 in). Like other Eucomis species, it has a basal rosette of strap-shaped leaves. These are up to 55 cm (22 in) long and 6–13 cm ( 2 + 1 ⁄ 2 –5 in) wide, with a wavy margin.
Eucomis comosa is a perennial plant, growing from a large bulb, which is often purple in colour. The leaves form a basal rosette, and are 30–80 cm (12–31 in) long by 3–10 cm (1–4 in) wide, with a smooth, slightly undulating margin. The leaves usually have purple spots and may have an overall purple tinge; var. striata has
The crown of a woody plant (tree, shrub, liana) is the branches, leaves, and reproductive structures extending from the trunk or main stems. Shapes of crowns are highly variable. The major types for trees are the excurrent branching habit resulting in conoid shapes and decurrent (deliquescent) branching habit, resulting in round shapes. Crowns ...
An open-centred crown on a short trunk of less than 1 metre (3 ft 3 in). This is a traditional and popular form for apple trees. Bush trees are easy to maintain and bear fruit at a young age. Final height is between 2 metres (6 ft 7 in) and 5.5 metres (18 ft), depending on which rootstock is used. [1]
Pandanus spiralis is a small tree growing up to 10 m tall with a slender trunk, and often with a clumping habit. Prop roots may be present, but are more often absent. The leaves are 1–2 m long and 4–7 cm wide, and they may or may not have sharp spines along the leaf margins and midrib.