Botany online 1996-2004. No further update, only historical document of botanical science!

Leaf Shapes

Herbarium Specimens

To the left: Asparagus acutifolius (Asparagus, Asparaginaceae; mediterranean): acicular, strongly reduced leaves; Middle: Linum catharticum (Cathartic Flax, Linaceae): The leaves are opposite, linear, sessile. To the right: Reseda luteola (Weld, Yellow Weed or Dyer's Rocket, Resedaceae): ensiform leaves, sessile, undivided, partially undulate.

To the left: Atropa belladonna (Deadly Nightshade, Solanaceae): The leaves are alternate, the leaf pairs of the inflorescences are close together, one leaf is smaller, one bigger. From the axil of each larger leaf springs one flower on a peduncle. The leaf shape is lanceolate to broad lanceolate with a clear leaf stalk and a smooth margin. - To the right: Celtis australis (Ulmaceae): The leaves are alternate, egg-shaped with pointed apexes, asymmetric and the leaf margin is serrate.

To the left: Pulmonaria mollis (Lungwort, Boraginaceae): The leaves are alternate, egg-shaped with pointed apexes, the leaf base is rounded and sessile. The upper leaves have a tendency towards a sheathing attachment. The leaf margin is entire and ciliate.- To the right: Smilax aspera (Smilacaceae; Mediterranean): The leaves are cordate and have entire leaf margins

To the left: Bryonia dioica (Common Bryony, Curcubitaceae): The leaves are alternate. They have leaf stalks and a broadly cordate outline. The leaf shape is palmately lobed, the single segment is egg-shaped to triangular and pinnatisect or irregularly serrate. The leaves are opposed by simple tendrils. - To the right: Rubus chamaemorus (Cloudberry, Rosaceae) has one to four alternate, stalked leaves that are palmately lobed with 5 - 7 heart to kidney-shaped segments. The margin is always lobed to serrate. The stipules of the upper leaves are degenerated to short fringes. Single flowers with five obovate petals and five lanceolate sepals each live at the tip of the branches.

To the left: Ficus carica (Fig Tree, Moraceae, mediterranean): The leaves are deeply palmately lobed and have five segments. - To the right: Quercus pubescens (Oak, Fagaceae): The leaves are pinnately lobed and have blunt segments with a rounded or weakly cordate base.

© Peter v. Sengbusch - Impressum