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Hernandez described two varieties of dahlias (the pinwheel-like Dahlia pinnata and the huge Dahlia imperialis) as well as other medicinal plants of New Spain. Francisco Dominguez, an Hidalgo gentleman who accompanied Hernandez on part of his seven-year study, made a series of drawings to supplement the four volume report.
Dahlia pinnata is a perennial herbaceous plant with a rhizome and tuberous roots, reaching a height of 70 to 120 centimetres (28 to 47 inches), rarely 160 cm. The stem is erect, and branched only in the inflorescence. The leaves are usually simple, with leaflets that are ovate and 5–10 centimetres (2–4 in) long. The plant is slightly shaggy.
When to Plant Dahlias by Seed. If you’d like to give your Dahlia seeds a head start to the growing season, sow them indoors before spring. “Dahlias can be started indoors from seed six to 10 ...
From its underground base, the plant will begin sending up hollow, cane-like, 4-sided stems with swollen nodes and large, tripinnate leaves; foliage near the ground is quickly shed. The pendant or nodding flowerheads are 7.5–15 centimetres (3–6 inches) across, with ray florets, typically a lavender or mauvish-pink in colour. [3] [4]
Zinnia elegans, also known as Zinnia violacea, is the most familiar species, originally from the warm regions of Mexico being a warm–hot climate plant. Its leaves are lance-shaped and sandpapery in texture, and height ranges from 15 cm to 1 meter. [5] Zinnia angustifolia is another Mexican species.
'Moonfire' (VanDusen Botanical Garden, Stan Shebs)The following is a list of dahlia cultivars which have gained the Royal Horticultural Society's Award of Garden Merit.They are tuberous perennials, originally from South America, with showy daisy-like composite flowerheads in all shades and combinations of white, yellow, orange, pink and red, flowering in late summer and autumn (fall).
There are 42 accepted species of flowering plants in the genus Dahlia, according to The Plant List. [1] The sectional classification of Dahlia sensu Sørensen (1969) [ 2 ] as updated by Saar et al. (2003) [ 3 ] and Hansen (2004) [ 4 ] and (2008) [ 5 ] is as follows (excluding infraspecific taxa);
Dahlia merckii, Merck's dahlia, is a tuberous species of perennial flowering plant in the daisy family, Asteraceae. This herbaceous plant grows to 2.5 metres (8 feet) in height. It has divided leaves , and in late summer to autumn produces single flowers in shades of lilac, white, and pink.