Download CU Walk – Identification of trees

Teacher’s copy
CU Walk (I) – Identification of trees
Objectives
1.
2.
3.
to practise observation of tree features
to understand the basic ideas of classification
to work out a tree diagram to show the relations of tree species & identify the tree species
Briefing
1.
Objectives of CU walk
2.
Terminology & guidance for observation
- trees, shrubs, woody plants, herbs
- names: common name vs scientific name
- habit, canopy, root, stem, leaves, flower, fruits, bark, etc.
- exemplar worksheet
Observation exercise: refer to data sheet
Arrangement of field study
- grouping:
- tutor of each group will tell the students the names of plants & each group will complete
the data sheet
3.
4.
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time allowed: 50 minutes for field work & photo-taking, 15-minute break, 30 minutes for
discussion
Further work
1.
2.
3.
Activity photos  upload under “Gardening Club activities”
Student project  upload under “Sharing”
Field studies:
- Other sites: trees species in CU Main Campus, our school campus, Sun Chui Estate, etc.
- Other plant types like shrubs & vines
References
1.
2.
CUHK: QEF site no.3 (CU site)  virtual tour, & plant checklist. www.hkflora.com (8/4/08)
Hong Kong Herbarium 香港植物標本室。www.hkherbarium.net/Herbarium/ (8/4/08)
3.
4.
Thrower S.L. (1988). Hong Kong Trees – Omnibus Volume. Hong Kong: Urban Council.
漁護署(2004)。《賞樹手記》。香港：天地圖書。
CU Walk (I) – Identification of Trees
Date: _____________
Name
1.
Site: Chung Chi
Family
Acacia
Mimosaceae
confusa 台 含羞草科
Habit
Evergreen
15m
灣相思
Characteristics
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Flowering: 3-10, flowers spherical
Fruit: legume
Leaf: phyllode, without petiole (compare with a
young leaf)
Ornamental plants: fast growth, resistant,
fire-break
Leaf sheath, parallel veins
Flowers: rare
Features similar to grass; unlike grass in having a
tough stem
Leaf: narrow, alternate, oil glands, no leaf stalk
Flowering: 5-6, bottle-brush, red, upright
flowers similar to Callistemon viminalis 串錢柳;
(except that in C. viminalis, flowers are drooping
down & flowering in 4)
Fruit: woody capsule; unopened for years
Branches: tough
Air root (not apparent in the site)
Leaf: pointed
Cones: pear shaped
Leaf: palm-like, 3-lobed, turn red in autumn
Fruit: brown, spiny, woody
Volatile oil (no scent in 楓樹)
Leaf: large, conc. at the top, palmate
Scars: angular rings
no branching
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Bisexual or unisexual flowers on one tree
Leaf: leathery, elliptical
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Similar to 蒲葵
Leaf: feathery, spiny petioles
Leaf scars – spiny
Branches: pendulous, weeping
Leaf: narrow
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2.
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Bambusa
Gramineae
tuldoides 花 禾本科
眉竹
3.
Callistemon Myrtaceae
rigidus 紅千 桃金娘科
Evergreen
2m
層
4.
Glyptostrobu Taxodiaceae
s pensilis 水 杉科
松
5.
Deciduous
20-30m
conical crown
Liquidambar Hamamelidace Deciduous
formosana ae 金縷梅科 25-40m
楓香
6.
7.
8.
Livistona
Arecaceae
chinensis 蒲 (Palmae) 棕
葵
櫚科
Monocot; with
dicot habit like
straight stem
evergreen
15m
Mangifera Anacardiaceae Evergreen
15-18m
indica 芒果 漆樹科
Phoenix
roebelenii
日本葵
9.
Salix
babylonica
Arecaceae
(Palmae) 棕
櫚科
Salicaceae
楊柳科
垂柳
3m
Deciduous
Water side
Broad round crown
15m
10. Taxodium
Taxodiaceae
distichum
杉科
var.
imbricatum
池杉
11. Taxodium
Taxodiaceae
distichum 落 杉科
羽杉
* Features for identification
Deciduous
30-45m
Group: __________________________
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Photo
no.
1a
2a
3a
3b
3c
4a
4b
5a
5b
6a
6b
7a
7b
7c
8a
8b
9a
9b
Similar to 落羽杉 except the leaf form; leaves
packed closely
10a,b,c,
d,e
Flood-tolerant
Root: aerial roots (knee) for breathing
Leaf: pinnate compound, narrow, alternate
Cones: globose
Similar to Metasequoia 水杉 except that leaves
alternate in 落羽杉, opposite in 水杉
11a,b,c,
d,e,f
Discussion
1.
Which plant(s) is/are in closer resemblance with Taxodium distichum 落羽杉 (plant 11)?
State the feature that separates this group of plants from the other. Name the plant group.
Ans:
Plants = 10 (also plant 4), feature = cones (found in Taxodium at the time of visit,
April), plant group = gymnosperm
2.
Which plant(s) is/are in closer resemblance with Bambusa tuldoides 花眉竹 (plant 2)?
the feature that separates this group of plants from the other.
State
Name the plant group
Ans: Plants = 6,8; Feature = parallel venation, plant group = flowering plant  monocot
3.
Which plant(s) is/are in closer resemblance with Mangifera indica 芒果 (plant 7)?
State the
feature that separates this group of plants from the other. Name the plant group.
Ans: Plants = 1,3,5,9; Feature: net-venation; plant group = flowering plant  dicot
4.
Is pine a monocot or a dicot?
Ans. It is neither a monocot or a dicot. It is a gymnosperm.
5.
With the features observed in your study, try to construct a key to help identify each tree
species in the field site.
Trees in Chung Chi, CUHK
Non-flowering,
With cones
Flowering,
Without cones
Appendix – Teaching points
1. Leaf form
- shape: broad leaves, lobes/lobe-like (楓香)
2.
3.
4.
venation: parallel venation, net-venation
simple/compound leaves
phyllode (expanded petiole) without leaf blade (台灣相思)
leaf sheath (竹, grasses)
- oil glands
Root – aerial root (落羽杉)
Flowers/cones
Taxa: plant  flowering/non-flowering (gymnosperms)  different families   scientific
names (genus + species)  variety (池杉 vs 落羽杉)
Student copy
CU Walk (I) – Identification of Trees
Date: _____________
Site: __________________ Group: __________________________
Name
Family
1.
Acacia confusa Mimosaceae 含
台灣相思
羞草科
2.
Bambusa
Gramineae
tuldoides 花眉竹 禾本科
3.
Callistemon
rigidus 紅千層
Myrtaceae
桃金娘科
4.
Glyptostrobus
pensilis 水松
Taxodiaceae
杉科
5.
Liquidambar
Hamamelidaceae
formosana 楓香 金縷梅科
6.
Livistona
chinensis 蒲葵
Arecaceae
(Palmae) 棕櫚科
7.
Mangifera
indica 芒果
Anacardiaceae
漆樹科
8.
Phoenix
Arecaceae
roebelenii 日本 (Palmae) 棕櫚科
葵
9.
Salix babylonica Salicaceae
垂柳
楊柳科
10. Taxodium
Taxodiaceae
杉科
distichum var.
imbricatum 池杉
11. Taxodium
Taxodiaceae
distichum 落羽 杉科
杉
* Features for identification
Habit
Characteristics
Photo
no.
Discussion
1.
Which plant(s) is/are in closer resemblance with Taxodium distichum 落羽杉(plant 11)?
the feature that separates this group of plants from the other.
State
Name the plant group.
________________________________________________________________________________
2.
Which plant(s) is/are in closer resemblance with Bambusa tuldoides 花眉竹 (plant 2)?
the feature that separates this group of plants from the other.
State
Name the plant group.
________________________________________________________________________________
3.
Which plant(s) is/are in closer resemblance with Mangifera indica 芒果 (plant 7)?
State the
feature that separates this group of plants from the other. Name the plant group.
________________________________________________________________________________
4.
Is pine a monocot or a dicot?
________________________________________________________________________________
5.
With the features observed in your study, try to construct a key to help identify each tree
species in the field site.
Trees in Chung Chi, CUHK
Non-flowering ,
With cones
Flowering,
Without cones
Appendix: Extract of students’ findings (Site: School campus; date: 9-15/1/07)
樹木四：紅花羊蹄甲 (Bauhinia purpurea, 蘇木科 Caesalpiniaceae)
樹木編號：
外觀
樹皮
花
果
原產地：
47
中國南部至西部、中南亞洲及馬來半島
習性：
落葉喬木，高 7m，胸徑 23cm，樹冠直徑 7m，樹冠呈傘狀
植物學特性：
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花：10-12 月開花（一月考察時仍見開花），花呈粉紅色，只有三
條雄蕊；花瓣明顯摺皺
-
果：莢果，成熟時變黑
葉：互生葉，呈心形狀，葉前端二裂，像羊蹄
樹皮光滑
明顯認樹特徵： 葉形是該屬 Bauhinia 的明顯特徵，它與同屬洋紫荊的分別是有果，而
後者不會結果，此外，它開花時間比宮粉洋蹄甲早，而三條雄蕊也是
獨特之處，其他同屬樹木擁有五條雄蕊
考察同學：
陳玉婷(4A)、覃沛豪(5A)