midrib

1 The lobes are paired, and each has a strong vein from the midrib.

2 A stiff midrib runs along the center of each petal and sepal, protecting the structure of the developing flower bud.

3 In autumn the yellow, channelled midribs turn red, and all the blades to purplish crimson, and this color stays a long time.

4 Two colorful varieties are ‘Red Giant’, with thick purplish-red leaves, and ‘Dragon Tongue’, with crinkled green leaves, purple veins and ivory-white midribs.

5 The basal portion of the betel leaf must be rejected, as it produces disease; the apical part, as it induces sin; and the midrib and veins, as they destroy the intellect.

6 About a week after the egg is laid it hatches into a small caterpillar that feeds upon the sides of the leaf and rests upon the midrib just as the Viceroy caterpillar does.

7 Many species, when at rest, fix themselves by means of their claspers to a small twig or leaf stalk, or on the midrib of the leaf itself.

8 In a simple leaf, the blade is either completely undivided—as in the banana leaf—or it has lobes, but the separation does not reach the midrib, as in the maple leaf.

9 These leaflets have toothed edges, are paler on the underside, and in a young condition the midrib and nerves are hairy.

10 In due course the bundles pass to the stemming department for the removal of the midribs which usually form nearly one-third of the entire weight.

11 While he sang, a second oriole swooped upward between two vanes of a frond to a small ball of fibers knotted close to the midrib.

12 Part B photo shows a teardrop-shaped linden leaf that has veins radiating out from the midrib.

13 The venation is strictly parallel, the midrib usually strong, and the other ribs more slender.

14 Eggs that are laid in the midrib on the underside of leaves first hatch in mid-May, but those infestations are followed by later generations in June, July and August.

15 She buys the leaves from Asia Market in Manhattan’s Chinatown, about a dozen a pack with the midribs cut out, folded like tablecloths.

16 The scientists marked a lily bud with dots along each petal's edge and "midrib" or central vein.

17 Now, however, mathematics has revealed that differential growth and ruffling at the edges of each petal—not in the midrib, as commonly suggested—provide the driving force behind the lily's bloom.

18 The midribs of the leaves, powerful but resilient, held aloft in generous arches the broad planes of translucent green substance.

19 The bag opens along its edge seam, the leaf-stem straightens, lifting the blade which is folded on the midrib.

20 Our marriage had become like a leaf eaten away by caterpillars, where the petiole and midrib remain with some ghostly connective tracery in between.

1 中脉

costa rachis medial media

2 主脉

costa costal