56

Opuntia Mill.

Opuntia stricta (Haw.) Haw. var. dillenii (Ker-Gawl.) Benson

Cactaceae

Except the real blue and black, there are all kinds of flower colors, and they are ever-changing. As the red flower, its color is different depending on the type. Many types of petals have a metallic luster and are very eye-catching. Many types of pistil stigma and stamen filaments have bright colors, especially some species of Echinocereus and Notocactus. The stigma is green and purple, with a velvety luster, splendouring with the petals, which is so beautiful

57

Incarvillea

Incarvillea younghusbandii Sprague

Bignoniaceae

Red and white

58

Crocus

Crocus sativus L.

Iridaceae

Light blue, red purple or white

59

Populus

Populus cathayana Rehd.

Salicaceae

Gray green, dark gray when old, cracked. Branches cylindrical, with angular prism sometimes. The branch is olive green when young, later turns into orange to grayish yellow, glabrous. Buds long conical, glabrous, purple brown or yellow brown, with mucilage

60

Salix

Populus × beijingensis W. Y. Hsu

Salicaceae

Bark grayish green, gradually turning into greenish gray, smooth; bark pores round or oblong, dense, ovate or broadly ovoid crown. Side shoots obliquely grows, tender twigs are slightly green or red, without ribs. Buds conical, apex curved, pale brown or dark red, with mucilage

61

Fraxinus L.

Fraxinus mandshurica Rupr

Oleaceae

Plant: taupe, dark brown. Leaf: dark green above, yellow green below

62

Pinus Linn

Prunus mume

Pinaceae

Gray green, dark gray when old, cracked. Branches cylindrical,