Digitalis purpurea L is a biennial or perennial herb. Previous taxonomy included it in the Scrophulariaceae, and Hyundai corrected it to Psyllium according to the classification of genetic analysis. This genus is native to Central Asia and western Asia, northwestern Africa, and western and southwestern Europe.
Artificial cultivars include white, pink and crimson, etc., generally divided into white-flowered free bells, large-flowered free bells, and double-petaled free bells. It is often used in flower borders, flower beds and rock gardens. It can also be used as a natural flower arrangement.
Herbs biennial or perennial, except for the corolla, are covered with gray-white pubescent and glandular hairs, sometimes glabrous on the stem, 60-120 cm tall. Stems solitary or clustered. Basal leaves mostly rosette-shaped, petiole with narrow wings, up to 15 cm in length; leaves ovate or oblong, 5-15 cm in length, apex sharp or obtuse, base tapering, edges with short pointed round teeth , Rarely serrated; the lower part of the stem leaves is the same shape as the basal leaves, gradually decreasing upward, and the petiole is short until sessile and becomes a bract.
萼 Campanulate, about 1 cm long, fruiting slightly increased, 5 lobes almost to the base; lobes rectangular-ovate, apex obtuse to acute; corolla purple-red, inner mask spots, 3-4.5 cm long, short lobes , Apex was white pilose.
Capsule ovate, about 1.5 cm long. The seeds are short stick-shaped, except for the honeycomb reticulate pattern, but also have very fine pilose. Flowering from May to June.
It is distributed in mountainous areas of 1200-1800 meters above sea level. It is cold-resistant and drought-resistant, but not hot, and can adapt to barren soil. It is sunny and shade-tolerant, suitable for growth on moist, well-drained soil.
Originating in Europe, there are sporadic cultivations all over Taiwan, such as Alishan, Taipingshan, Cingjing Farm, Nantianchi and other places, with a large number of naturalization.
Commonly used for sowing and seed propagation, seedlings, transplantation, cultivation and direct seeding.
1. In the south, flat or high tillers are used to raise seedlings. In the north, impotence is used to raise seedlings. In the impotence, rotten horse dung is used as the bottom fertilizer. The fertilizer particles are fully mixed with the bed soil and leveled. Spread and cover with thin mats for insulation. Usually open the thin seats at about 10 am and cover the seats at 4 pm to promote humidity. When the seedlings grow to 3-5 leaves in mid-May, they are planted in the field according to the row spacing of 30cm × 20cm, and watered after planting.
2. The direct seeding method saves labor. In the north, the soil is sown after the soil is thawed in April and mid-April, or before the soil is frozen in November; the south should be sown in late autumn. The seeds can be sown directly or germinated with warm water at 20 ℃.
It is suitable for potting. If it is cultivated in the greenhouse, it can bloom in early spring. Because of its tall, inflorescence flower shape characteristics, it can be used in flower borders, flower beds, rock gardens. Can be used for natural flower arrangement.
Digitalis is an important cardiotonic drug that excites myocardium, enhances myocardial contractility, improves blood circulation, or directly inhibits the intracardiac conduction system, slows heart rate, treats chronic congestive heart failure, and has significant diuretic effects on cardiac edema Swelling effect, but the accumulation effect, pay attention when using.
1. The effect of enhancing myocardial contractility. Under the effect of cardiac glycoside, the characteristics of enhanced myocardial contraction are:
(1) Make myocardial contraction agile. Cardiac glycosides can increase the tension of myocardial contraction and accelerate the rate of myocardial contraction, which is manifested by the increase in the maximum rate of increase of the intraventricular pressure. Therefore, myocardial contraction is quick and powerful, shortening the systolic period and extending the diastolic period in the cardiac cycle Is beneficial to venous return;
(2) Increase the output of a failing heart;
(3) Improve the efficiency of a failing heart.
2. The effect of slowing the heart rate of heart failure.
3. Impact on myocardial conductivity, autonomy and refractory period:
Digitalis saponin, a glycoside obtained from the leaves and seeds of digitalis digitalis. A kind of steroidal saponin. When hydrolyzed, a molecule of digitonin can be formed as an aglycone moiety. As a sugar moiety, there are 2 molecules of D-glucose and 2 molecules of galactose and 1 molecule of wood. sugar. These sugar moieties are bound to the hydroxyl group of the third carbon atom of digitonin. Because it can form digitonin compounds that are hardly soluble in water with steroids (such as cholesterol) with free 3β-OH in equal molecular ratios, this feature is used to characterize sterols and Separation.
origin of name
Foxglove is a typical naturalized plant. His hometown is far from temperate regions of Western Europe. It is called foxglove because it has hairy stems and leaves and leaves resembling foxglove, hence the name of foxglove; and because it is from a distant Europe, it is also called digitalis.
It is said that the bad fairy gave Foxglove flowers to the fox, and asked the fox to put the flowers on its feet to reduce the footsteps it made when searching for food among Foxgloves. Therefore, Foxglove has another name-Fox gloves. In addition, foxglove has other aliases such as witch gloves, fox suits, fairy gloves, and dead man's bell.