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Exploring Bletilla striata: The Orchid of Lush Green Elegance

The Bletilla striata, also known as the Chinese ground orchid, belongs to the Orchidaceae family. The leaves are alternately arranged on the branches; the leaves on the flowering branches or short branches are small, oval or ovate.

The flowers, which are fragrant, comprise multiple blossoms that form a cluster or corymbose inflorescence. The calyx is bell-shaped, with triangular-lanceolate petals.

The corolla is purple-blue, and the stamens are attached midway to the inner wall of the corolla tube. The ovary is ovate and hairless, with an ovoid stigma. The ellipsoid capsule fruit contains numerous, elongated, grey-brown seeds that are bordered by short wings.

The blooming period is from May to July, and the fruiting period is from July to October. The Chinese ground orchid is a terrestrial orchid species, with orderly purple-red flowers that exude elegance against the lush green leaves.

Bletilla striata

Other variations include white, blue, yellow, and pink flowers. It is suitable for flower beds, planting beside pathways or rocks, or as ground cover under sparse forests. It can also be grown indoors in pots.

I. Morphological characteristics

Plant: A shrub, 1-4 meters in height.

Branches: The long branches are either opposite or alternate, slender, and often arc downwards at the upper part. The short branches are clustered and typically covered with star-shaped short velvety hairs to almost hairless. The twigs are quadrangular or nearly cylindrical.

Leaves: The leaves on the long branches are alternate, clustered on the short branches. The leaves on the long branches are lanceolate or linear-lanceolate, 3-10 cm long, 2-10 mm wide, with an acute or blunt apex, cuneate base, usually entire or wavy-toothed.

The upper surface is dark green, initially covered with greyish-white star-shaped short velvety hairs, becoming almost hairless with age. The underside is densely covered with greyish-white star-shaped short velvety hairs.

The petiole is 1-2 mm long. The leaves on the flowering branches or short branches are small, oval or ovate, 5-15 mm long, 2-10 mm wide, with a rounded to blunt apex, and a cuneate base that extends to the petiole.

Bletilla striata

The margin is entire and has wavy teeth. The pubescence is similar to that of the leaves on the long branches.

Flowers: The flowers are clustered or corymbose, forming inflorescences. The inflorescences are short, dense, 1-4.5 cm long, 1-3 cm wide, often appearing on the biennial branches.

The inflorescence stalk is very short and usually has a few small leaves at the base. The flower stalk is 3 mm long. The flowers are fragrant.

The calyx is bell-shaped, 2.5-4 mm long, quadrangular, densely covered on the outside with greyish-white star-shaped velvety hairs and some glandular hairs.

The calyx lobes are triangular-lanceolate, 0.5-1.7 mm long, 0.8-1 mm wide, and sparsely covered on the inside with glandular hairs. The corolla is purple-blue, initially covered with star-shaped hairs, later becoming hairless or nearly hairless.

The corolla tube is 6-10 mm long, 1.2-1.8 mm in diameter, glandular hairy in the throat, later becoming hairless. The corolla lobes are nearly round or broadly ovate, 1.2-3 mm long and wide. The stamens are attached midway to the inner wall of the corolla tube.

Bletilla striata

The filaments are very short, and the anthers are oblong, 1-1.8 mm long, with an acute apex and cordate base. The ovary is ovate, about 1.2 mm long, about 0.7 mm in diameter, and hairless. The style is about 1 mm long, and the stigma is ovoid.

Fruit: The capsule fruit is ellipsoid, about 5 mm long, about 2 mm in diameter, and hairless. The seeds are numerous, elongate-oval, 1.5-2 mm long, grey-brown, and bordered by short wings.

Flowering and fruiting period: The flowering period is from May to July, and the fruiting period is from July to October.

II. Growth Environment

The Opposite-leaved Fishweed lacks a distinctive main stem above the ground, growing in clumps with strong branching ability. It has a well-developed root system, especially the main root that almost equals the above-ground part in length.

The plant prefers south or southeast-facing slopes with an incline of 250 to 350 degrees. It thrives in areas with annual rainfall less than 350mm, an average annual temperature of 5℃, a frost-free period of 120 days, a dry climate with frequent wind, low air humidity, and thin or even exposed rocky soil.

Despite these harsh conditions, Opposite-leaved Fishweed grows robustly and thrives, undamaged by livestock due to their aversion to it, demonstrating a strong survival capability.

III. Distribution Range

Bletilla striata

It is found in dry mountain shrublands or riverside shrubs at altitudes between 1,500 and 4,000 meters.

IV. Growth and Propagation

Container Seedling

Spring is the time for seedling cultivation. Peat, mature sheep manure, and fine sand are mixed in a 2:1:1 ratio, sterilized, and placed in hole trays or nutrient bags.

The seeds are sown evenly in the container and watered to maintain moisture. When the seedlings reach 20 cm in height, they are transplanted.

Hardwood Cuttings

Choose a substrate with strong water permeability, such as perlite. In early spring, select healthy one-year-old branches free from pests and diseases, trim them into 15-20 cm long cuttings, soak them in water for 24 hours, and then plant. Water appropriately and maintain the seedlings.

Softwood Cuttings

Bletilla striata

Fine sand, perlite, and grass charcoal are mixed in a 1:1:2 ratio, sterilized, and placed in hole trays or containers.

In June or July, choose healthy current-year shoots free from pests and diseases, trim them into about 10 cm-length cuttings with 2-4 leaves, treat the cuttings with a rooting hormone at a concentration of 100 mg/kg immediately before planting, then plant.

Water the cuttings 4-5 times daily after planting. Reduce watering after rooting, and harden off the seedlings about a week before they sprout. Softwood cuttings have the advantages of a short cycle and a high rooting rate.

V. Pest Control

The primary method for controlling pests and diseases is proper soil management. The root system of the Alternanthera philoxeroides is well-developed, particularly the primary root, which grows quickly.

It is advisable to transplant first-year seedlings; otherwise, the primary root may become too long and difficult to plant. The precise amount of seeds required for sowing may vary depending on the location, so it is necessary to determine this through testing under different conditions.

To control common occurrences of black spot disease, a solution of 70% methylobenzene wettable powder diluted 1000 times should be sprayed.

VI. Main Value

Medicinal Value

Medicinal Category: Hemostatic, astringent herb.

Characteristics and Meridians: Bitter, sweet, astringent, slightly cold. Associated with the lungs, liver, and stomach.

Functions and Indications:

  • Hemostatic, reduces swelling, promotes tissue regeneration.
  • Used for coughing up blood, bleeding from injuries, abscesses, skin fissures.
  • Tuberculosis with hemoptysis, ulcer bleeding.

Usage and Dosage: 6~15g, powdered and ingested at 3~6g. Apply externally as needed. Should not be used with aconite.

Storage: Store in a ventilated, dry place.

Clinical Applications:

  • Single herb powder or mixed with white and applied with a gauze bandage to treat bleeding injuries.
  • Single herb powder, boiled with radish soup, mixed with candle oil, and applied to treat frostbitten hands and feet.
  • Finely ground single herb, mixed with thin rice gruel, swallowed slowly to treat throat obstructions.

Gardening Value

Alternanthera philoxeroides is a type of terrestrial orchid, with its orderly purple-red flowers providing a dignified and elegant contrast against the lush green leaves. The flowers also come in white, blue, yellow, and pink.

They can be used to decorate flower beds, planted alongside garden paths or among rocks, or used as ground cover in sparse forests. They also make attractive indoor potted plants.

Edible Value

The tuber contains mucilage and starch, which can be used as a thickening agent or in medicine.

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Peggie

Peggie

Founder of FlowersLib

Peggie was once a high school mathematics teacher, but she set aside her chalkboard and textbooks to follow her lifelong passion for flowers. After years of dedication and learning, she not only established a thriving flower shop but also founded this blog, “Flowers Library”. If you have any questions or wish to learn more about flowers, feel free to contact Peggie.

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