There is a great assortment of trees in the plaza as well as the street surrounding the square. I have numbered the trees in the picture and each plant is named below. Those with a blog entry can be linked to pictures and descriptions.
I tried to make it a circular walk but its easier said than done.
1. Pinus canariensis - Canary Island Pine (a row of 5-6 trees along Mission St)
2. Schinus molle - California Peppertree (5 trees at both sides of the entry)
3. Calocedrus decurrens - California Incense Cedar (young tree)
4. Eriobotrya deflexa - Bronze Locust (2 or 3 younger trees in front of HC School)
5. Cornus florida 'Welchii' - Variegated Flowering Dogwood)
6. Azara serrata - Sawtooth Azara (further down the side of the HC school)
7. Trachycarpus fortunei - Chinese Windmill Palm
8. Magnolia grandiflora - Southern Magnolia (one of two on either side of park)
9. Tilia americana - American Linden (maybe a different species of linden)
10. Platanus acerifolia - London Plane Tree (3 large trees in center of park)
11. Juniperus (not sure what species it is)
12. Syagrus romanzoffiana - Queen Palm (in court yard of the mission)
13. Cryptomeria japonica - Japanese Cryptomeria (Pine)
14. Araucaria bidwillii - Bunya-bunya Tree
15. Callistemon viminalis - Weeping Bottlebrush (2 trees)
16. Metrosideros excelsa - New Zealand Christmas Tree
17. Picea abies - Norway Spruce
18. Chionanthus retusus - Chinese Fringe Tree (at the corner of the building)
19. Sapium sebiferum - Chinese Tallow tree (Triadica sebifera is its new name)
20. Pinus radiata - Monterey Pine
21. Cedrus deodara Deodar Cedar - Deodar Cedar (on the corner)
22. Maytenus boaria - Mayten Tree
23. Azara microphylla - Box-leaf Azara (3 in front of house)
24. Phoenix canariensis - Canary Island Palm
25. Nyssa sylvatica - Black Tupelo (Gum)
26. Metasequooia glyptostroboides - Dawn Redwood
27. Phoenix dactylifera - Date Palm
28. Eucalyptus ficifolia (Corymbia filcifolia) - Red Gum (Eucalyptus is the old name) this is a pink one.
29. Tilia cordata (small tree) - Little Leaf Linden (bigger ones up Mission St.)
30. Aesculus x carnea - Red Horse Chestnut
31. Washingtonia robusta - Mexican Fan Palm (on Mission St.)
Additional trees not on the list:
Olea europaea - Olive tree in the mission courtyard
Acer palmatum - Japanese Maples by the church entrance
Lagerstroemia - Crape Myrtle by the church doors