Flowers: Calyx pink at base, light green above, sepals ascending, very unequal, to 13 mm; petals valvate; corolla 7, 5-10 mm long, yellow above, orange below.
They mainly differ in such minor characters as leaf-shape and -size, sepal expansion and corolla colour and are placed here in synonymy.
Stamens 2, inserted at base of corolla tube, scarcely exserted.
Having a bilaterally symmetrical corolla somewhat resembling a butterfly, characteristic of most plants of the pea family.
A perennial plant(Spigelia marilandica)native to the southeast United States having flowers with a tubular corolla that is red outside and yellow rhizomes and roots were once used as a vermifuge.
The thread in the corolla is the short filament of a degenerated stamen.
Method: Pick corolla from male flowers every morning before ten o 'clock, and then smear it on the stigma of female flowers.
Or the corolla could open, but the petal was long, narrow and upstanding.
The hood-shaped sepal or corolla of some flowers.
Inflorescence terminal, racemose-umbellate，4-6- flowered； corolla funnel-campanulate,4.5 cm long, pink,5- lobed, lobes rounded emarginated; stamens10-12,2-3 cm long, filaments sparsely tomentose on lower half; ovary stellate-tomentose, style5 cm, with a few glands at base.
Height, breadth and diameter of corolla are the important ornamental characters of petunia.
sunflowers repay sun with sun - like golden corolla. birthworts repay the sky with clear petals. i repay you with sincere heart and enthusiasm of creation, my kind father.
Flowers: Sepals strongly ascending to appressed, longest 4 – 5 mm, corolla globose-urceolate, pentagonal, to 10 x 8 mm in diameter, petals apiculate, orange -red.
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