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Ceanothus thyrsiflorus, known as blueblossom or blue blossom ceanothus, is an evergreen shrub in the buckthorn family Rhamnaceae that is endemic to Oregon and California in the US. The term 'Californian lilac' is also applied to this and other varieties of ceanothus, though it is not closely related to Syringa , the true lilac.
The flower heads are 3–5 cm (1 + 1 ⁄ 4 –2 in) wide, [5] and usually light blue [6] or lavender; it has also rarely been described as white or pink. [5] Of the two rows of involucral bracts, the inner is longer and erect, the outer is shorter and spreading. It flowers from March until October. [6] The seed has small scales at the tip. [6]
This herbaceous annual or dwarf shrub grows to 0.3–1 m (1 ft 0 in – 3 ft 3 in) high, with ovate to triangular leaves 2–7 cm (0.79–2.76 in) long, and blue flowerheads (sometimes white, pink, or purple). The flower heads are borne in dense corymbs. The ray flowers are threadlike and fluff-haired, leading to the common name.
Ajuga reptans is commonly known as bugle, blue bugle, bugleherb, bugleweed, carpetweed, carpet bugleweed, and common bugle, and traditionally however less commonly as St. Lawrence plant. It is an herbaceous flowering plant in the mint family Lamiaceae, native to Europe.
The plant is classified by several different botanical names. Both the current United States Department of Agriculture database and The Jepson Manual of California flora (2013) classify it as S. nigra subsp. cerulea. [1] [2] The Sunset Western Garden Book identifies the plant as Sambucus mexicana, and note use of S. caerulea also. [5] [6]
The cultivar 'Ugandense' is an untidy evergreen shrub growing to 4 m (13 ft) tall and 2.5 m (8.2 ft) broad, with oval leaves and masses of pale-violet blue butterfly-like flowers in summer and autumn. Each flower has a darker blue lower petal.
Ruta graveolens, commonly known as rue, common rue or herb-of-grace, is a species of the genus Ruta grown as an ornamental plant and herb. It is native to the Balkan Peninsula. It is grown throughout the world in gardens, especially for its bluish leaves, and sometimes for its tolerance of hot and dry soil conditions.
Neutral blue (rather than purplish or greenish), greenish-blue, and intense blues, available in some related Delphinium plants—particularly Delphinium grandiflorum—do not occur in this genus. Aconitum plants that have purplish-blue flowers are often inaccurately referred to as having blue flowers, even though the purple tone dominates.
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