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花园 (6)
动态 (3585)
Dummer. ゛☀
2017年07月16日
Dummer. ゛☀
Family - Fabaceae Flowering - August - October.
Habitat - Fields, pastures, waste ground, disturbed sites, roadsides, railroads.
Origin - Native to Asia. Other info. - This aggressive weed can be found throughout Missouri growing in the habitats mentioned above. Any traveler driving along a major highway or roadway can see large stands of this plant along the roadside. It was first collected wild in the state in 1938 by Steyermark. The plant was introduced as erosion control, food for cattle and wildlife, and shelter for small animals. This species is very drought resistant and thrives on neglect. Unfortunately, there is no effective control for the plant at this time.
L. cuneata is easy to ID in the field because of its sericeous stems and small white flowers, which have two purple splotches at the base of the standard.
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Dummer. ゛☀
2017年07月16日
Dummer. ゛☀
Family - Brassicaceae Stems - To +/-70cm tall, erect, herbaceous, typically single from the base and branching in upper 1/3, occasionally branching at the base, from a taproot, glabrous to puberulent.
Leaves - Alternate, the basal leaves typically wilted by anthesis, sessile, serrate (sometimes doubly) to entire, mostly glabrous, deep green above, to +/-5cm long, 1cm broad, oblanceolate to oblong or linear. Inflorescence - Terminal and lateral racemes, compact in flower, quickly elongating in fruit, dense, to +/-10cm long. Pedicels 2-4mm long in flower, sparse puberulent adaxially, to 5mm in fruit, spreading.
Flowers - Petals 4, white, minute or sometimes absent, to 2mm long, 1mm broad, clawed. Stamens 2 or 4, erect. Filaments white, glabrous, to +1mm long. Anthers yellow. Ovary orbicular, compressed, glabrous, green, 1mm in diameter. Style wanting. Sepals 4, cupped, greenish-white, with scarious margins, glabrous, 1mm long, -1mm broad. Silicles to 3mm in diameter, green, glabrous, drying to a brownish color, with a small notch at apex. Flowering - February - November. Habitat - Fields, waste ground, disturbed sites, glades, prairies, pastures, roadsides, railroads.
Origin - Native to U.S. Other info. - This species can be found throughout Missouri. The common name for the plant is "Pepper Grass" because the silicles have a peppery taste when ripe. The seeds are edible and are eaten by a variety of wildlife. This plant is weedy and can sometimes be found in profusion in the habitats mentioned above.
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Dummer. ゛☀
2017年07月16日
Dummer. ゛☀
Family - Brassicaceae Stems - To .75m tall, densely villous, multiple from base, branching above, erect to ascending, from taproot, herbaceous.
Leaves - Alternate. Cauline leaves clasping, entire, crenate or shallow dentate, lanceolate, dense on stem. Basal leaves petiolate, entire or with shallow lobes.
Inflorescence - Compact terminal racemes elongating in fruit to +25cm long(tall). Axis and pedicels villous. Pedicels to 8mm long in fruit, spreading. Flowers - Petals 4, white, clawed, to 3mm long, 1.2mm broad, glabrous, spatulate. Stamens 6. Ovary compressed. Stigma capitate, yellowish. Style short, persistent in fruit. Fruits - Silicles 5-6mm long(high) when mature, ovate in outline, notched at apex, winged, glabrous, 1 seed per cell in fruit. Flowering - April - June.
Habitat - Disturbed sites, waste ground, roadsides, railroads. Origin - Native to Europe. Other info. - Despite the fact that the flowers are very small, the plant itself actually quite showy. It is just one of the many introduced members of the Brassicaceae. The plant is common in the state but not quite as common as L. virginicum, which is everywhere.
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Dummer. ゛☀
2017年07月16日
Dummer. ゛☀
Family - Brassicaceae Stems - Plants mostly acaulescent, from a taproot. Scapes to +10cm long in fruit, glabrous, erect, herbaceous, multiple from the base.
Leaves - In a basal rosette, petiolate, to +5cm long, +/-1.4cm broad, glabrous. Blades deeply pinnatifid. Divisions acute, each typically with 2 or more lateral lobes. Terminal division the largest, typically 5-lobed. Leaf tissue at base of divisions tapering up the rachis and ending just before the next leaf division. Inflorescence - Single flower terminating each scape.
Flowers - Petals 4, white with yellow at base, clawed, glabrous. Claw to 2mm long. Limb 5mm long, 3mm broad, rounded to blunt at the apex. Stamens 6, didynamous(4 & 2), erect. Filaments to 5.5mm long, white, glabrous. Anthers pale yellow, 1mm long. Ovary green, cylindric, glabrous, 2-valved, 4.5mm long, 1mm in diameter. Style short and thick, -1mm long. Sepals 4, erect, whitish-green or with a pinkish-red tinge(especially at the apex), acute, entire, linear-oblong, glabrous, gibbous at base, 4.5mm long, 1.5mm broad. Siliques to 2.5cm long, glabrous, slightly compressed, beaked. Beak to 2mm long. Seeds many. Flowering - March - April.
Habitat - Limestone glades and bald knobs. Origin - Native to U.S. Other info. - This is a neat little plant which can be found in the Ozark region of Missouri. The plant has a short growing season but is striking when in flower. It would make a good rock garden specimen and grows well from seed. This species is easily identified in the field by its pinnatifid leaves and big (for the size of the plant) flowers.
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Dummer. ゛☀
2017年07月15日
Dummer. ゛☀
Family - Ranunculaceae Stems - To +30cm tall, herbaceous, glabrous, purplish-red, erect, from a small caudex and fibrous roots.
Leaves - Alternate, petiolate, stipulate, ternately divided. Petioles of the basal leaves to +/-12cm long, glabrous. Petiolules glabrous. Petioles of the upper leaves reduced. Ultimate divisions of the leaves rounded at the apex, with a minute mucro, glabrous, often pale below, purplish-green. Leaves to +/-8cm broad, +/-6cm long, reduced upwards.
Inflorescence - Single axillary flowers. Flowers becoming more dense near the apex of the stems. Stipules subtending the flowers scarious-purple, rounded, glabrous. Pedicels glabrous, to +/1cm long. Leaves reduced to bracts in the inflorescence. Flowers - Petals absent. Sepals petaloid. Sepals 5(6), white, glabrous, entire, rounded at the apex, slightly tapered at the base, oblong-elliptic, to +/-1cm long, +/-5mm broad, distinct. Stamens many, +/-50, arising from below the carpels, mostly erect. Filaments white, glabrous, to 4mm long, very thin, clavate. Anthers yellow, globose, .4-.5mm in diameter. Pollen white. Carpels 6, arranged in a ring, green, erect, distinct, glabrous, +/-3mm long in flower. Ovary 1mm long. Style 2mm long. Stigma minute. Receptacle naked. Flowering - March - May.
Habitat - Low woods, ravines, flood plains. Origin - Native to U.S. Other info. - You know spring has arrived when you start to see this little plant bloom. It adds a splash of white to the understory of woods covered with the drab leaves of fall and winter. The plant forms colonies with its horizontal creeping stems. It is usually associated with other species such as Claytonia virginica, Eyrthronium albidum, and Erigenia bulbosa. The species name comes from the leaves which are "twice three-times divided" or biternate, (even though some are triternate).
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Dummer. ゛☀
2017年07月15日
Dummer. ゛☀
Family - Convolvulaceae Stems - Vining, twining, somewhat woody - especially below, to many meters long, branching or not, somewhat angled, glabrous to pubescent. Root is large (+50cm long and weighing up to 30 pounds), vertical, and tuber-like.
Leaves - Alternate, petiolate. Petioles to +/-9cm long, glabrous to pubescent, with a shallow adaxial groove. Blades typically cordate, sometimes pandurate, entire, acute, glabrous to pubescent, green above, light green below, to +/-15cm long, +/-11cm broad, entire. Margins often wavy. Inflorescence - Axillary pedunculate cymes of 2-10 flowers. Pedicels to +2cm long, glabrous. Each division of cyme subtended by foliaceous bracts. Bracts to +/-2cm long.
Flowers - Corolla white with a wine-colored base internally, salverform, to +/-8cm long and broad, glabrous. Stamens 5, unequal, adnate near base of corolla tube, included. Filaments to +2cm long, glabrous apically, pubescent and expanded slightly at base. Anthers whitish-pink, +/-8mm long. Style 3.5cm long, glabrous, white, included. Ovary superior, green, conic, 1-2mm long, 2-locular, with 2 ovules. Placentation axile. Ovary with a green nectary at base. Stigma biglobose, 2-3mm broad, becoming brown when dried. Calyx of 5 unequal sepals. Sepals distinct, overlapping, with rugose venation, the largest to +2.5cm long, +/-1.6cm broad, glabrous, entire, elliptic-ovate, acute, often with a purple tint. Flowering - May - September.
Habitat - Moist soils, thickets, waste ground, disturbed sites, roadsides, railroads. Origin - Native to U.S. Other info. - Steyermark lists two forms for the state. Form pandurata (pictured above) has short hairs on either one or both leaf surfaces. Form leviuscula Fern. has glabrous leaves. These forms are probably not valid. Like most of the members of this genus, this plant can get weedy, but it is quite striking in full flower. The leaves of this species are quite variable, especially when the plant is young.
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