This video is the first in the 2024 series of aquatic plant identification webinars - part of the BSBI's Irish Aquatic Plants Project, supported by NPWS. Expert Nick Stewart presents: Identification of Large Floating-leaved Aquatic Plants.

00:00 Introduction
02:40 Books and keys
06:36 List of species and genera
08:20 Key characters for plants with expanded opaque floating leaves
09:15 3 groups based on leaf lobing
10:06 Group 1 - Palmately-lobed
10:58 Water Crowfoots Ranunculus spp.
11:40 Celery-leaved Buttercup Ranunculus sceleratus
12:46 Floating Pennywort Hydrocotyle ranunculoides
14:03 Marsh Pennywort Hydrocotyle vulgaris
14:35 Group 2 - Unlobed - leaf venation character
15:39 Unlobed, herring-bone venation: Amphibious Bistort Persicaria amphibia
16:40 Water Primroses Ludwigia spp.
21:20 Unlobed, parallel venation: Pondweeds Potamogeton spp.
23:20 Water Hawthorn Aponogeton distachyos
23:57 Water Plantains Alisma spp.
27:29 Starfruit Damasonium alisma
28:31 Group 3 - Two basal lobes
29:18 Two basal lobes, circular venation: Frogbit Hydrocharis morsus-ranae
31:03 Two basal lobes, arrow shaped: Arrowhead Sagittaria sagittifolia
33:28 Water lilies - 3 types
47:21 Q&A session

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