Not sure which species this is from; Viola striata, I think, or possibly Viola pubescens.  I just like the look of the seedpods.

Aruncus dioicus; Rosaceae (rose family)

According to one expert from the Maryland Native Plant Society, goatsbeard grows in the coastal plain and is rare in the piedmont, so I’m a little tickled that I found it near Cabin John Creek.  It can grow up to six feet tall, and likes wet soils.  The plants I found were growing right out of a steep hillside next to the water.

Goatsbeard is one of the few native perennials showy enough to be a common garden plant.  You can find cultivars for sale at any decent plant nursery.

extreme closeup:

Iris versicolor; Iridaceae (iris family)

Sometimes I’m so focused on seeing small, hidden, hard-to-find flowers that I miss the really big ones.  Last weekend while walking on the towpath Steve stopped me to ask “garden escapee?” while pointing at this:

Well, no, actually, that is a native iris: larger blue flag.  According to the USDA site, there are four other native irises found in this area: slender blue flag, Virginia iris, dwarf crested iris, and dwarf violet iris.

This iris likes to have its feel wet: you’ll see it growing in or right next to shallow bodies of water.  There’s a small marsh between the towpath and the river, between Carderock and Old Anglers’ Inn, that has a large stand them.  They grow up to three feet tall.

Kalmia latifolia; Ericaceae (heath family)

I don’t usually play favorites, but if I had to choose a favorite plant family, it would be the Ericaceae.  Something about the overall form and color of ericaceous plants (not just the flowers) is incredibly appealing. 

Mountain laurel is a tall understory shrub, preferring a rocky habitat and acidic soils.  It’s evergreen, but often with very sparse foliage, and the form is lanky.  Look closely at the picture above and you’ll see all these empty branches curling around.  In recent years the nursery industry has developed kalmia cultivars with more compact forms, better suited to gardens, but I think they look like glorified rhododendrons.  I like the plant the way nature designed it.

Other ericaceous plants you might be familiar with:

• azaleas and rhododendrons
• blueberries and cranberries
• wintergreen
• bear berry
• trailing arbutus
• Japanese pieris
• heaths and heathers
• sourwood (delicious honey!)
• enkianthus
• leucothoe

Galium concinnum; Rubiaceae (madder family)

I post this with some trepidation, as I’m not sure that I got the species right.  For sure it is a Galium of some sort.  If you’re walking along in the shady woods and see little clouds of white dots seeming to float a foot or two above the ground, you’re probably looking at a bedstraw.  This one has unusually tiny leaves.  The flowers are about a sixteenth of an inch across.