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Ambrosia artemisiifolia is an annual plant that emerges in late spring. It propagates mainly by rhizomes, [clarification needed] but also by seed. [4] It is much-branched, and grows up to 70 centimetres (2.3 ft) in height. [9] The pinnately divided soft and hairy leaves are 3–12 centimetres (1.2–4.7 in) long. [9]
Poa annua, or annual meadow grass (known in America more commonly as annual bluegrass or simply poa), is a widespread low-growing turfgrass in temperate climates. Notwithstanding the reference to annual plant in its name, perennial bio-types do exist. [2] This grass originated as a hybrid between Poa supina and Poa infirma. [3]
Iva annua is an annual herb up to 150 cm (5 feet) tall. The plant produces many small flower heads in a narrow, elongated, spike-like array, each head with 11–17 disc florets but no ray florets. [4] Marshelder has a unique odor when the leaves or pollen are touched, but this odor is not present in winnowed seed.
The plant has an erect rough-hairy stem, reaching typical heights of 3 metres (10 feet). The tallest sunflower on record achieved 9.17 m (30 ft 1 in). [3] Sunflower leaves are broad, coarsely toothed, rough and mostly alternate; those near the bottom are largest and commonly heart-shaped.
A Palmer oak in Jurupa Valley is estimated to be 13,000 to 18,000 years old. The plant, which looks like a sprawling, dark green shrub, is now at the center of a development battle.
Zinnia is a genus of plants of the tribe Heliantheae within the family Asteraceae. [3] [4] They are native to scrub and dry grassland in an area stretching from the Southwestern United States to South America, with a centre of diversity in Mexico. Members of the genus are notable for their solitary long-stemmed 12 petal flowers that come in a ...
Oenothera biennis, the common evening-primrose, [3] is a species of flowering plant in the family Onagraceae, native to eastern and central North America, from Newfoundland west to Alberta, southeast to Florida, and southwest to Texas, and widely naturalized elsewhere in temperate and subtropical regions. [4]
Gaillardia / ɡ eɪ ˈ l ɑːr d i ə / [3] (common name blanket flower) [4] is a genus of flowering plants in the family Asteraceae, native to North and South America.It was named after Maître Gaillard de Charentonneau, [5] [6] an 18th-century French magistrate who was an enthusiastic botanist.