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Prickles on a blackberry branch. In plant morphology, thorns, spines, and prickles, and in general spinose structures (sometimes called spinose teeth or spinose apical processes), are hard, rigid extensions or modifications of leaves, roots, stems, or buds with sharp, stiff ends, and generally serve the same function: physically defending plants against herbivory.
It has been suggested that the ideal human figure has its navel at the golden ratio (, about 1.618), dividing the body in the ratio of 0.618 to 0.382 (soles of feet to navel:navel to top of head) (1 ⁄ is -1, about 0.618) and Leonardo da Vinci's Vitruvian Man is cited as evidence. [23]
Vachellia drepanolobium, more commonly known as Acacia drepanolobium or whistling thorn, [1] is a swollen-thorn acacia native to East Africa. The whistling thorn grows up to 6 meters tall. The whistling thorn grows up to 6 meters tall.
Vachellia tortilis, widely known as Acacia tortilis but now attributed to the genus Vachellia, [4] is the umbrella thorn acacia, also known as umbrella thorn and Israeli babool, [5] a medium to large canopied tree native to most of Africa, primarily to the savanna and Sahel of Africa (especially the Somali peninsula and Sudan), but also occurring in the Middle East.
Its trunk is spiny and up to nine meters in girth (9.4 feet thick DBH) and its leaves are bipinnate. Each pinna has a single pair of ovate-oblong leaflets that are about 2 to 4 cm (0.79 to 1.57 in) long. The flowers are greenish-white, fragrant, sessile and reach about 12 cm (4.7 in) in length, though appear shorter due to coiling.
Quercus douglasii is a medium-sized tree with sparse foliage, generally 6–20 meters (20–66 feet) tall, with a trunk 36–60 centimeters (1–2 ft) in diameter at breast height. [5] Trunks are typically solitary, but some trees have multiple trunks. [5] [8] The tallest recorded specimen was found in Alameda County, at 28.7 m (94 ft).
Those balloons often reach heights of 20 miles above Earth -- or twice as high as planes typically fly. Sensors beam data back down to Earth every few seconds as winds carry the balloons up to 125 ...
Vachellia is a genus of flowering plants in the legume family, Fabaceae, commonly known as thorn trees or acacias. It belongs to the subfamily Mimosoideae . Its species were considered members of genus Acacia until 2009.