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1. The trees are armed. (have thorns or spines) |
Go to #2 |
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+ The trees are unarmed. (no thorns or spines) |
Go to #4 |
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2. Thorns on thorn, often extremely thorny, leaves once or twice compound. Fruit a wide, flat pod, dark brown when mature, 10-18" long. |
HONEY LOCUST |
![](https://static.inaturalist.org/photos/65305324/large.jpg?1585767425) |
+ No thorns on thorns |
Go to #3 |
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3. The bark has corky outgrowths tipped with short thorns. Leaflets often have prickles |
HERCULES CLUB |
![](https://static.inaturalist.org/photos/65327124/original.jpg?1585779620) |
+ Compound leaf branches into two parts; stout straight thorns up to 2" long. Fruit a rounded pod, 6-9” long |
HONEY MESQUITE |
![](https://static.inaturalist.org/photos/65327006/original.jpg?1585779550) |
4. Leaves are twice-compound, leaflets coarsely toothed or lobed. Fruit a small round ball, green or yellow when mature |
CHINABERRY |
![](https://static.inaturalist.org/photos/65326811/large.png?1585779449) |
+ Leaves are once-compound, margins smooth or toothed, but leaves are not lobed. |
Go to #5 |
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5. Leaflets are finely toothed. |
Go to #6 |
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+ Leaflets have smooth margins. |
Go to #7 |
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6. Largest leaflets near the middle of leaf, last leaflet often small or missing. 15-23 leaflets, bark is dark and cracked into rough diamonds when mature. |
BLACK WALNUT |
![](https://static.inaturalist.org/photos/65468314/large.jpg?1585885915) |
+ Largest leaflet near the end of the leaf, and there is usually a terminal leaflet present; leaf has 11-17 curved leaflets. Bark is gray, very rough and craggy. |
PECAN |
![](https://static.inaturalist.org/photos/65326157/original.jpg?1585779102) |
7. Leaflets are oval shaped, small. Fruit hanging in a "string of beads." |
EVE’S NECKLACE |
![](https://static.inaturalist.org/photos/65327505/large.jpg?1585779848) |
+ Leaflets are lanceolate |
Go to #8 |
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8. Bark is light gray; leaflets 7-19, alternate on rachis, usually no terminal leaflet; mild smell when crushed. |
SOAPBERRY |
![](https://static.inaturalist.org/photos/65325705/original.jpg?1585778854) |
+ Bark is cinnamon colored; usually has a terminal leaflet, except on very young trees; leaflets have strong, peppery scent when crushed. |
CHINESE PISTACHE
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![](https://static.inaturalist.org/photos/66144518/original.png?1586363098) |
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