YELLOWSTONE ARBORETUM
Billings, Montana @ ZooMontana
Venation
"A Tree's Lifeblood"
The arrangement of veins in a leaf is called the venation pattern. Veins bring nutrients and liquid to leaf cells.
PARALLEL - The veins run parallel except where they meet at the tip and the base.
PINNATE - Secondary veins are spaced along a central midvein. Pinnate refers to "ladderlike."
PALMATE - Several primary veins diverge from a point. Palmate leaves can vary in the number of primary veins, usually 3 or more.
DICHOTOMOUS - Veins fork by twos extending from a common point forming a “y” pattern fanning out. Ginkgo biloba is the only species exhibiting dichotomous venation.
Click below to enlarge
Multiple content questions and answers (examples):
Q: How many different trees are in the arboretum?
A: We have almost 200 different accessioned species of trees, woody shrubs and vines.
Q: Can I tell the difference between trees?
A: Yes, we have a t least one tree of each species is signed for identification with the common name and Latin name.
Q: How old are the trees?
A: Our Native trees like the cottonwood can be over 75 years old. Trees planted for the arboretum began in the early 90's.
Q: Are the trees in a particular location.
A: No, the arboretum covers the entire Zoo grounds which is 70 acres. The trees are everywhere !