disturbed

Showing 61–72 of 79 results

Pteridium aquilinum / common bracken
- a fern with large, triangular fronds, up to 4 ft tall
- fronds subdivided into triangular leaflets
- herbaceous perennial
- deciduous with annual regrowth first appearing as fiddleheads in spring
- wide range of habitats, including full sun
Rhamphospermum arvense / Charlock
- yellow-flowered brassica; flowers larger than most mustards
- large-ish leaves with toothed margins
- erect stems; look for a reddish purple ring at stem junctions
- disturbed areas, road sides and waste places; prefers high nutrients
- 1" siliques point out or up, but not down
Rumex acetosella / sheep sorrel
- long, vertical inflorescences... not compact or well "organized"
- female plants with red/maroon flowers; males with green/white flowers
- especially visible when seeds are ripe... red
- basal rosette of arrowhead shaped leaves
- disturbed areas, wastelands, poor sites
Rumex crispus / curly dock
- rather large, lance-shaped leaves
- curly leaf margins, like crisped bacon or "crinkly-wavy"
- tall flowering stalks with many, many small yellow/green-ish flowers
- fruits are just like the flowers but deep red
- widespread and very much a weed
Silene latifolia / white campion
- white, 5-petaled flowers with distinctive inflated calyx (bladder)
- flowers in clusters atop stems
- whole plant densely hairy
- widespread on alkaline soils (e.g. the Valley)
Sisymbrium altissimum / tumble mustard
- inflorescence a raceme with yellow, teeny flowers
- long, thin seed pods (siliques)
- blooms throughout the spring and summer
- shoots look like a bunch of sticks glued together
- dries and breaks off, then tumbles
Solanum physalifolium / ground cherry nightshade
- flowers look like potato or tomato flowers
- small white, 5 recurved petals
- clump of yellow stamens protrude from flower
- triangular leaves with wedge-shaped bases
- usually sprawling on ground
Solidago canadensis / goldenrod
- large sprays of yellow flowers in late summer and fall
- often tall and in large colonies
- lance-shaped, toothed leaves
- mostly (but not always) in disturbed areas
Solidago missouriensis / Missouri goldenrod
- perennial herb, up to 40" tall
- inflorescence is a branching panicle with many (≥200) yellow flower heads
- involucres are ¼ long with 3 or 4 layers of narrow, pointed, hairless, yellow-green bracts
- leaves are thin and lanceolate, upright and rigid with prominent midribs
- upper leaves have pronounced but small teeth
Sonchus arvensis / field sowthistle
- yellow dandelion-like
- multiple flowers per stalk
- often in patches in wet fields
- leaves spiney but without lobes, clasping the stems
- often several stems from a single point at the soil level
Tanacetum vulgare / tansy
- yellow, somewhat flattened, button-like flowers
- pretty clearly in the aster family
- camphor-ish smell
- finely divided, fern-like compound leaves
Thlaspi arvense / field pennycress
- inflorescence a raceme with white, teeny flowers
- oval seed pods ca. 1/3" across
- blooms late spring and summer
- continues blooming as pods fill from older flowers
- common weed in disturbed habitats including cultivated land