Category: Dichotomous Keys

I cannot tell if plant 3 has a single set of opposite (palmate?) leaves or a whorl. At any rate, the leaf arrangement with a single flower on each stem stands out to me.

Dichotomous Key for Picea (Spruces) – Plant 1 Image Needles not clustered, directly attached to a twig  Needles lie flat Needles straight, ⅝-1” long, sharp, growing on all sides of branches………. Sitka Spruce (Picea Sitchensis)  Needles on all sides Needles straight, 2.5cm long (longer needles), sharp, four-angled, and roll between …

Here’s my Dichotomous Key drawn out in my field sketchbook. It was a bit of challenge for me to think in such a linear way. It seems I like to note the differences in the plants in a bit of a jumble and this exercise kind of forced me to …

    A. Species is a tall forest tree with cones…………………………………… plant 1 A’. Species found in forest understory, smaller trees and lacking cones……………………… B. Plants with prominent midrib on the leaves – plant 4 B’ Plants lacking prominent midrib on the leaves- C C. Species with hairy stems and …

  A: Plant with cones – Plant 1 A’: Plant without cones – B (Plants 2, 3, and 4) B: Plant has no petals – Plant 4 B’: Plant has petals – C (Plants 2 and 3) C: Plant has white flowers – Plant 2 C’: Plant doesn’t have white …

A. Plants with flowers  -B A’. Plants without flowers  (Plant 1) B. Flowers with petals  – C B’. Flower without petals (Plant 4) C. Flowers with purple petals (Plant 3) C’. Flowers without purple petals (Plant 2)

A. Plant has a flower – B A’. Plant lacks flower – Plant 1 B. Flower have petals – C B’. Flower lack petals – Plant 4 C. Less than 4 petals C’. At least 4 petals – D D. 4 (white) petals – Plant 2 D’. 6 (purple) petals …

A: Without Flowers B: Tree with pinecones – Plant 1 B1: Small exposed stamens and pistils, leathery leaves – Plant 4 A1: With flowers C: Multiple white flowers per stalk – Plant 2 C1: Single purple flower per stalk – Plant 3

Anne Young    amyoung14

Anne Young   amyoung14 I didn’t realize I had such a diverse selection of dishware. Without looking, I suspect there is an artifact key for pottery/dishware since a lot of it shows up in archaeological digs. I know there is a key for beads.

A. Plants without flowers……………………… Plant 1 A’. Plants with flowers: B. Plants without petals…………….. Plant 4 B’. Plants with petals: C. Plants with white petals…………. Plant 2 C’. Plants with blue petals…………… Plant 3

A.  Plants with needle-like leaves; non-flowering plant…..………Plant 1 A1.  Plants with needle-like leaves, broad leaves, or stemless; flowering plant B.  Plants with white or yellow petals C.  Plants with white petals…………………………………Plant 2 C1.  Plants with yellow petals……………………………..Plant 3 B1.  Plants with no petals……………………………………………Plant 4

1A.  Leaves needle-like; stems woody…………………………………………………………………………….      Plant 1 1B.  Leaves with flattened blade, simple or lobed; stems herbaceous………………………………………………       2 2A.  Leaves deeply lobed; stamens numerous; petals purple………………………………………………      Plant 3 2B.  Leaves unlobed; stamens 2-6; petals white or absent…………………………………………………..      3 3A.  Flowers either staminate or pistillate on separate inflorescences; petals absent…..      Plant …

A. Bark present; leaves needle-like – Plant 1 A’. Bark absent; leaf with blade – go to B B. Perianth absent, flowers in catkins – Plant 4 B’. Perianth present; flowers single or in a raceme – go to C C. Flowers white; single pistil – Plant 2 C’. Flowers …

A Plant has cone -plant 1 A1 Plant has flower B1 Flower has white petal-plant 2 B2 Flower has purple petal-plant 3 C1 Flower has no petal