hollow stem

Giant Hogweed Heracleum mantegazzianum showing red spotted stems and variable leaf shape

Water horsetail Equisetum fluviatile with strobili shown emerging from fresh water.

Marsh horsetail Equisetum palustre with strobili growing in shallow water or marshland.

Field horsetail Equisetum arvense, with background.

Horsetails: Calamophytes Field horsetail Equisetum arvense, Marsh horsetail Equisetum palustre, & Water or River horsetail Equisetum fluviatile

Cow Parsley sketchbook study sheet.  Detail of seed head, flowers, and leaves and roots are shown.

Cow Parsley sketchbook study sheet with written notes.  Detail of seed head, flowers, and leaves and roots are shown.

Habit sketch of Cow parsley Anthriscus sylvatica with hollow stem & leaf attachment detail

Cow parsley Anthriscus sylvaticus Habit sketch showing entire plant.

Water horsetail showing two sterile stems and two fertile stems, one with leaves and one without.  Also showing cross section of the stem, and the rhizome.

Giant hogweed Heracleum sphondylium showing white corymbs of flowers, different shaped leaves, and cross section of the hollow stem

Elder Sambucus nigra berries, flowering head and details

Wood horsetail Equisetum sylvestris plant, stem detail, and flowering spike

Water horsetail Equisetum fluviatile pencil illustration showing flower and leaf

Marsh horsetail Equisetum palustre small pencil illustration

Lesser Water Parsnip Berula erecta with individual flower and fruit

Hemlock Conium maculatum showing spotted ste, umbels, male flower detail, individual fruit, and the leaves

Elder Sambuccus nigra flowering head and berries, somewhat depleted along with leaves

Cow parsley Anthriscus sylvestris with individual flower details and showing hollow stem along with umbels and seeds

Cow parsley illustration in pencil with details of stem, leaves and flowering head picked out in watercolour, and with a small view of the plant grwing at a distance, close up study of the individual flower and its anatomy

Giant hogweed Heracleum mantegazzianum study giving an impression of the enormous size of this tall umbellifer plant with its thick stems and froth of white flowers; details of individual flowers and seeds in colour, and one leaf illustrated in full colour