Sihai network

Introduction of Stylosanthes

Stylosanthes, whose stamens and styles are combined to form a style and bend downward under the petals, will pop up "beating" insects at a very fast speed when insects come to collect honey, and innocent frightened insects can only fly to another flower. Stylosanthes helps its pollination in such a strange way. This interesting style grass, let's get to know it!

Introduction of Stylosanthes: the shape of Stylosanthes: most of the Stylosanthes plants are perennial herbs, and a few are annual herbs or subshrubs. The plant height ranges from a few centimeters to 1.8 meters; Single leaf, opposite, alternate or clustered on stem, or basal and arranged in rosette shape, without stipules or stipules degenerated into scales; Flowers bisexual, solitary, or symmetrical, rarely radially symmetrical, forming racemes, cymes or sparse spikes; Calyx tube adnate to ovary, 5-7-lobed, slightly 2-lipped; Corolla united, lobes imbricate, unequal, the lowest lobes labial; Stamen 2, and style into a style, known as syncytial style, the top at the beginning of bending down, touch the elastic, anther 2-locular; Ovary inferior, 2-locular or 1-locular at base, with more than one ovule per locule; Capsule, many seeds, with fleshy endosperm.


In general, the syncytial column protrudes from the center of the flower and bends downward into an inverted U shape. When insects come to collect honey, the syncytial column is mechanically stimulated and pops up within 10-20 ms at a certain angle. Therefore, Stylosanthes is also called trigger plant. After a few minutes to half an hour, it returns to the initial position (the movement speed is related to the temperature, the higher the temperature, the faster the speed). The movement of the syncytial column is caused by a motor tissue located in the bending part of the syncytial column, which changes its shape after being stimulated. In the trigger process of syncytial stigma, the syncytial stigma will contact with insects. Due to the different maturity time of stamens and stigmas, it is beneficial to avoid self pollination. The stamens mature first, and the syncytial stigma will touch the insects when contacting with insects, and then the stigma will mature. In the next trigger process of syncytial stigma, the stigma will receive the pollen from insects.

There are glandular hairs on the stem, calyx and back of petal of Stylosanthes, which are similar to those of caltrop. The glandular hairs are slightly shorter. There are red glands on the top of the glandular hairs, which can secrete mucus and digestive juice and can prey on insects, but the ability to catch insects is weak.