Emergent Plant Series: #1, Submerged Plant Stage (3.19485)

Date: 1950s
Creator: Watts, May Theilgaard
Type: Drawing
Description:Part of a series of numbered illustrations about the stages of pond growth. This material includes an aerial view of a pond with trees and hills in background, and a cross-section view of five types of submerged aquatic plants attached to pond bottom.

Header: SUBMERGED PLANT STAGE / PLANTS ATTACHED TO BOTTOM / only their flowers reach the surface

Drawings and text from top to bottom, left to right:

• pond and surrounding landscape
• cross-section:
  • WATER WEED--Elodea canadensis
  • EEL GRASS--Vallisneria spiralis
  • PONDWEED--Potamogeton crispus
  • HORNWORT--Ceratophyllum demersum
  • WATER MILFOIL--Myriophyllum spicatum

Extent: 1 sheet

Emergent Plant Series: #2, Floating-Leaf Plant Stage (3.19486)

Date: 1950s
Creator: Watts, May Theilgaard
Type: Drawing
Description:Part of a series of numbered illustrations about the stages of pond growth. This material includes an aerial view of a pond showing some plants at the surface of its bay with trees and hills in background, and a cross-section view of aquatic plants attached to pond bottom, with leaves and flowers of shallower plants extended to water's surface.

Header: FLOATING-LEAF PLANT STAGE / PLANTS ATTACHED TO BOTTOM / leaves and flowers floating at surface

Drawings and text from top to bottom, left to right:

• pond and surrounding landscape
• cross-section [divided into 4 sections]:
  • FLOATING LEAF ZONE
    • water lily
    • cow lily
  • SUBMERGED PLANT ZONE
    • water weed
    • eel grass
    • pondweed
    • hornwort
    • water milfoil
  • SUBMERGED PLANT STAGE
  • FLOATING LEAF ZONE

Extent: 1 sheet

Growth of Pond: Submerged Plant Stage (3.19492)

Date: 1940 – 1950
Creator: Watts, May Theilgaard
Type: Drawing
Description:Part of a series of illustrations about the stages of pond growth. This material includes an aerial view of a pond with two bays and a cross-section view of five types of submerged aquatic plants attached to pond bottom.

Header: SUBMERGED PLANT STAGE / PLANTS ATTACHED TO BOTTOM / only their flowers float on the surface

Drawings and text from top to bottom, left to right:

• Pond: sheltered bays are first to show vegetation
• CROSS-SECTION of MARGIN
  • Water milfoil--Myriophyllum spicatum
  • Water weed--Elodea canadensis
  • Eelgrass--Vallisneria spiralis
  • Pondweed--Potamogeton crispus
  • Hornwort--Ceratophyllum demersum

Extent: 1 sheet

Growth of Pond: Emergent Plant Stage (3.19494)

Date: 1940 – 1950
Creator: Watts, May Theilgaard
Type: Drawing
Description:Part of a series of illustrations about the stages of pond growth. This material includes an aerial view of a pond with some plants showing at the surface of its edges and its bays, and a cross-section view of aquatic plants attached to pond bottom, with leaves and flowers of shallower plants extended up to and above the water's surface.

Header: EMERGENT PLANT STAGE / PLANTS UPRIGHT / only roots and base under water

Drawings and text from top to bottom, left to right:

• Pond
• CROSS-SECTION of MARGIN [divided into 3 sections]:
  • Emergent Plant Zone
    • cat-tails
    • arrowhead
    • bur reed
    • pickerel weed
    • bullrush
  • Floating Plant Zone
    • white water lily
    • cow lily
  • Submerged Plant Zone
    • pondweed
    • eel grass
    • water milfoil
    • etc.

Extent: 1 sheet