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Annuals, Perennials, Vines, and Groundcovers > Leaf Morphology > Flashcards

Leaf Morphology Flashcards

1
Q

Reflexed

A

Bent or curved backward or downward

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2
Q

Alternate

A

One leaf borne per node; leaves spiral around twig

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3
Q

Obovate

A

Widest point is above the middle, L:W <2

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4
Q

Lobed

A

A leaf with distinct projections from the midrib with individual inside veins

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5
Q

Simple leaf

A

An undivided or uninterrupted leaf blade (uninterrupted main vein(s) )

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6
Q

Oblanceolate

A

Widest point is above the middle, L:W >3

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7
Q

-ulate

A

suffix for diminutive size

(first syllable of base word + suffix)

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8
Q

Reniform

A

Simple kidney-shaped leaf

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9
Q

Acuminate

A

Leaf apex shape, prolonged point

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10
Q

Scurfy

A

Leaf covered with small scalelike particles

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11
Q

Peltate

A

Round leaf, with the stem attached near the center of the lower surface rather than the margin

e.g. nasturtium

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12
Q

Spine

A

Modified sharp, pointed leaf

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13
Q

Opposite

A

Two leaves per node; leaves opposite each other on the twig

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14
Q

Petiolule

A

Stalk of a leaflet

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15
Q

Linear

A

Widest point is at the middle, elongated leaf, L:W >5

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16
Q

Dentate

A

Toothed margin (think: mountain shape)

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17
Q

Petiole

A

Leaf stalk

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18
Q

Crenate

A

scalloped margin

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19
Q

Teeth

A

Small indentations

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20
Q

Pinnatifid

A

A leaf with a blades divided into narrow lobes and with sinuses extending more than halfway to the midrib

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21
Q

Spinose

A

Margin baring small spines

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22
Q

Thorn

A

Modified sharp pointed branch

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23
Q

Pubescent

A

Leaf with a hairy surface

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24
Q

Sinus

A

On a leaf, a space or indentation between two lobes or teeth

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25
Q

Rugose

A

Wrinkled–typical leaves of the mint family

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26
Q

Decompound

A

Leaves more than once pinnately compound

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27
Q

Twice pinnately compound

A

Leaves twice pinnately compound (pinnately compound leaflets arranged pinnately on a main elongated axis)

28
Q

Acute

A

Leaf apex shape, pointed

29
Q

Lanceolate

A

Widest point is below the middle, L:W >3

30
Q

Zonation

A

Markings on the leaf, usually circular in pattern

31
Q

Axillary bud

A

Bud at the base of any leaf, indicates the base of a petiole vs a stem (which does not have a bud)

32
Q

Prickle

A

Sharp outgrowth of epidermis or bark, occures at internodes

33
Q

Cordate

A

Leaf base shape, notched

34
Q

Internode

A

The segment of the stem between nodes

35
Q

Rachis

A

Main axis of a compound leaf of inflorescence from which leaflets or flowers are borne

36
Q

Compound leaf

A

Leaf blade divided into segments

37
Q

Tuberous root

A

A modified lateral root, enlarged to function as a storage organ

38
Q

Viscid

A

Leaf covered with sticky or resinous secretion

39
Q

Palmate compound

A

Compound leaf with all leaflets arranged at the apex of the petiole

40
Q

Cuneate

A

Leaf base shape, pointed

41
Q

Obtuse

A

Leaf apex shape, rounded

42
Q

Rotund

A

Leaf base shape, rounded

43
Q

Ovate

A

Widest point below the middle, L:W <2

44
Q

Blade

A

Broad, expanded part of the leaf

45
Q

Entire

A

Smooth margin

46
Q

Leaflet

A

Photosynthetic division of a compound leaf

47
Q

Dwarf shoots

A

Leaves arranged on lateral shoot, shoot is < 1”

48
Q

Whorled

A

Three or more leaves per node

49
Q

Node

A

One of the spots upon a stem where buds occur

50
Q

Verticillate

A

Another term for ‘whorled’

51
Q

Oblong

A

Widest point is at the middle, elongated leaf with nearly parallel sides, L:W 3-5

52
Q

Pinnately compound

A

A compound leaf with leaflets arranged on opposite sides of one elongated axis

53
Q

Succulent

A

Thick fleshy tissue adapted to water storage

54
Q

Attenuate

A

Leaf base shape, prolonged point

55
Q

Variegated

A

The presence of two or more colors in the leaves, petals, or other parts of plants

56
Q

Visual difference between thorn and spine

A

A thorn occures at nodes between the stem and leaf where there would normally be a bud that would break into a branch.

A spine occures outside of the bud or branch.

57
Q

Retuse or Emarginate

A

Leaf apex shape, notched

58
Q

Procumbent

A

Spreading along the ground but not rooting at the nodes

59
Q

Clasping leaf

A

Leaf whose base partially or completely surrounds a stem

60
Q

Pin shoots

A

Leaves arranged on lateral shoot, shoot is ≥ 1”

61
Q

Maculation

A

Spotted coloration

62
Q

Decussate

A

Adjacent pair of leaves is rotated about 90°

63
Q

Elliptic

A

Widest point is at the middle, L:W <2

64
Q

Glaucous

A

Leaf covered with a whitish powder or waxy coating

65
Q

Stipule

A

One of a pair of leaf-like appendages often found at the base of the petiole

66
Q

Sessile

A

Leaf attached directly to the stem

67
Q

Serrate

A

saw-tooth margin

Annuals, Perennials, Vines, and Groundcovers (10 decks)

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