STEM SHAPE
Western Marsh-orchid Marsh-orchids all dactylorhiza species?
 Hollow
Angelica (Garden)
Angelica (Wild)
Balsam (Himalayan)
Burdock (Lesser)
Burnet-Saxifrage (Greater)
Buttercup (Bulbous)
Chervil (Bur)
Chives
Coltsfoot
Cord-Grass (Common)
Couch (Sand)
Dandelion
Dead-Nettle (Cut-Leaved)
Dead-Nettle (Henbit)
Dead-Nettle (Red)
Dead-Nettle (White)
Dogstail (Crested)
Garlic (Few-Flowered)
Garlic (Field)
Garlic (Three-Cornered)
Giant Rhubarb (Brazilian)
Giant Rhubarb (Chilean)
Hair-Grass (Wavy)
Hemlock
Hemp Agrimony
Hemp-Nettle (Bifid)
Hemp-Nettle (Common)
Hemp-Nettle (Large-Flowered)
Hogweed
Hogweed (Giant)
Honeysuckle (Himalayan)
Horsetail (Field)
Horsetail (Great)
Knotweed (Giant)
Knotweed (Lesser)
Maize
Marigold (Marsh)
Moor-Grass (Purple)
Nettle (Fen)
Nettle (Small)
Nettle (Stinging)
Orchid (Common Spotted)
Orchid (Early Marsh)
Orchid (Heath Spotted)
Orchid (Northern Marsh)
Orchid (Southern Marsh)
Ramsons
Rush (Slender)
Sandwort (Sea)
Sedge (Glaucous)
Sow Thistle (Common Blue)
Sow-Thistle (Prickly)
Sow-Thistle (Smooth)
Spearwort (Greater)
Spurge (Caper)
Spurge (Cypress)
Spurge (Dwarf)
Spurge (Mediterranean)
Spurge (Petty)
Spurge (Portland)
Spurge (Sea)
Spurge (Sun)
Spurge (Turkish Wood)
Spurge (Twiggy)
Thistle (Milk)
Thorn-Apple
Vetchling (Grass)
Water-Dropwort (Hemlock)
Water-Parsnip (Lesser)
Watercress
Watercress (Fool's)
Watercress (Narrow-Fruited)
Dill
Horsetails
many Umbellifers (all umbellifers?)
water celery
carrot
alpine sow thistle
sow thistles ('sonchus' Greek meaning 'hollow'
greater birdsfoot trefoil
other birdsfoot trefoils??
motherwort
hemp-nettles
spurges + milky sap
Japanese knotweeds
Three Cornered Garlic [hollow triangular, not round]
Few flowered Garlic [hollow triangular, not round]
some other Umbellifers: Cow Parsley?,
Bamboo
Many grasses
etc, etc
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