Silphium integrifolium Michx.

국표에 없다.

Silphium integrifolium is a species of flowering plant in the family Asteraceae. Its common names include rosinweed, whole-leaf rosinweed, entire-leaf rosinweed, prairie rosinweed, and silflower. It is native to eastern North America, including Ontario in Canada and the eastern and central United States as far west as New Mexico.

Description

This species is a perennial herb growing from a fibrous root system and producing stems up to 2 meters (6 ft 7 in) tal It can form a large clump of up to 100 stems. The stems are hairless to slightly rough-haired, and sometimes waxy in texture. The leaves are stemless and oppositely arranged on the stems. The basal leaves are lost by maturity. The leaf blades are lance-shaped to ovate, smooth-edged or toothed, hairless to rough-haired, and up to about 23 cm (9 in) long. The inflorescence holds one to 15 flower heads. The head is lined with 2 or 3 rows of phyllaries which are hairless or rough and sometimes glandular, and have rounded bases and pointed tips. The head has up to 36 yellow ray florets and many yellow disc florets. The fruit has a short pappus.

There are two varieties of the species:

• Silphium integifolium var. integrifolium – 40 to 200 cm (1 ft 4 in to 6 ft 7 in) in height
• Silphium integifolium var. laeve – generally 100 to 150 cm (3 ft 3 in to 4 ft 11 in) tall, with more florets and hairless leaves

 

 

Silphium integrifolium - Wikipedia

https://youtu.be/ZAEbNBwIENo?t=761