학명: Pontederia cordata L.
영명: Pickerelweed
분류: 물옥잠과(Pontederiaceae)
동속식물: -
원산지: 북중남미
아래 사진: 관곡지에서
아래는 세미원에서
아래 종은 흰색이 강한 것으로 보아 품종 'Alba'로 보인다.
설명:
Perennial aquatic herb, 15 cm - 1.2 m tall.
Stems
of two types: rhizome-like, contracted, vegetative stems, which are submersed underwater; and erect, flowering stems, which are slightly constricted just below the first node.
Leaves
of two types: a basal rosette of stalkless, linear leaves, which are normally underwater; and emergent, stalked (up to 60 cm), lance- to heart-shaped, 6 - 22 cm long, 0.7 - 12 cm wide stem leaves with a 7 - 29 cm long stipule. The leaf stalks of the emergent leaves are distinctly constricted just below the blades. Veins of leaf blades all parallel, curved, and never with netlike veins between them.
Inflorescence
a long-stalked, elongate spike (2 - 15 cm long) of fifty to several hundred, stalkless flowers. The inflorescence stalk is glandular-hairy or long, silky-hairy, and the upper part of the stalk has a 5 - 17 cm long bract folded around it.
Flowers
numerous, stalkless, mauve, 4 - 12 mm long, 1 - 1.6 cm wide, bilaterally symmetric, two-lipped, but generally funnel-shaped with spreading lobes. The flowers are only open for one day.
Tepals
six, but fused into a 3 - 9 mm long tube, then separating into 5 - 8 mm long, inversely lance-shaped, pointy-tipped lobes, which together appear as an upper three-lobed lip, and a lower three-lobed lip. The tepals are covered with glandular or long, silky hairs, and while all tepals are mauve, the upper, central lobe has a distinctive, two-lobed, yellow spot.
Stamens
six, but of two lengths: the upper three short (1.5 - 6.3 mm long), and the lower three longer (0.7 - 1.3 cm long). Filaments purple, and glandular-hairy. Anthers yellow, and egg-shaped to oblong.
Pistil
with one, three-chambered, superior ovary; and one, three-lobed style.
Fruit
a spike of numerous, single-seeded, single-chambered, egg-shaped, 4 - 6 mm long, 2 - 3 mm wide, bladder-like units (utricles), which have longitudinal, toothed ridges.
Flowering:
June to September
Habitat and ecology:
Somewhat rare, close to shores and in shallow water of lakes and slow-moving streams, also in shallow open water of bogs.
Notes:
This is the only species of Pontederia in North America, and it extends south into Mexico, Central America, and South America. There can be much variation in leaf shape within populations and even on single plants
설명 출처: