자작나무속(Betula) 자생종, 검색표

   ● 자작나무속(Betula) 자생종

만주자작나무 Betula platyphylla Sukaczev

자작나무 Betula platyphylla var. japonica (Miq.) H. Hara

백두산자작나무 Betula ovalifolia Rupr.

좀자작나무 Betula fruticosa Pall.

거제수나무 Betula costata Trautv.

박달나무 Betula schmidtii Regel

개박달나무 Betula chinensis Maxim.

물박달나무 Betula davurica Pall.

사스래나무 Betula ermanii Cham.

※ 자작나무속(Betula) 자생종 보기

☞ 박달나무 => http://blog.daum.net/kheenn/15854887

☞ 개박달나무 => http://blog.daum.net/kheenn/8730410   http://blog.daum.net/kheenn/15002776   http://blog.daum.net/kheenn/15857277

http://blog.daum.net/kheenn/15858163

☞ 물박달나무 => http://blog.daum.net/kheenn/15851456   http://blog.daum.net/kheenn/15851616  

☞ 사스래나무 => http://blog.daum.net/kheenn/15858027   http://blog.daum.net/kheenn/15853020   http://blog.daum.net/kheenn/15857218

☞ 자작나무 => http://blog.daum.net/kheenn/11605512

☞ 거제수나무 => http://blog.daum.net/kheenn/15853035  

※ 자작나무속(Betula) 검색표

<박상진 교수의 나무세상 http://webbuild.knu.ac.kr/~sjpark/v1/>

1. 측맥이 7쌍 이상이다.

2. 수피가 하얗고 피목이 가로로 있다.

* 미세한 복거치와 측맥이 10-16쌍이면 ·························································································→ 거제수나무

* 불규칙한 톱니와 측맥이 7-11쌍이면 ···························································································→ 사스래나무

2. 수피는 흑갈색이고 비늘처럼 벗겨진다.

3. 잎은 크고 어릴 때는 피목이 가로로 생기며 산록에 주로 분포한다. ········································→ 박달나무

3. 잎이 작고 크게 자라지 않으며 주로 높은 산에 분포한다. ·····························································→ 개박달

1. 측맥이 7쌍 이하이다.

4. 수피가 하얗고 피목이 가로로 있으며 잎은 거의 3각형이다. ······························································→ 자작나무

4. 수피는 회흑갈색의 종이를 더덕더덕 붙여 놓은 것 같고 잎은 달걀모양이다. ······························→ 물박달나무

1. 잎은 측맥이 7쌍 이상이다.

2. 잎자루는 길이 5~30mm이다.

3. 가지에는 선점이 없고, 피목은 옆으로 길며 열매는 난형 또는 난상 타원형으로 길이 2cm이고 위를 향한다.

    잎자루는 길이 8~15mm이다. ·························································································································································→ 거제수나무

3. 가지에 선점이 있고, 피목은 둥글고 열매는 긴 타원형이며 길이 2~3cm이고 잎자루는 길이 5~35mm이다. ··················→ 사스레나무

2. 잎자루는 길이 5~10mm이다.

4. 열매는 원통형이며 길이가 2~3cm이고, 잎은 뒷면에 선점이 있으며, 잎뒷면 잎맥과 잎자루에 털이 있다. ························→ 박달나무

4. 열매는 난형이며 길이 1.5~2cm이고 잎은 뒷면에 선점이 없다. ······························································································→ 개박달나무

1. 잎은 측맥이 7쌍 이하이다.

5. 열매는 밑으로 처지고 잎자루는 길이 1.5~2cm이다.

6. 포는 세로 능선이 있고 날개 너비는 종자 너비의 1~1.5 배이다. ························································································→ 만주자작나무

6. 포는 능선이 없다. 날개 너비는 종자 너비의 1.5~2배이다. ·········································································································→ 자작나무

5. 열매는 곧게 서고 잎자루는 길이가 1.5cm 이하이다.

7. 가지와 잎 뒤에 선점과 털이 있다

8. 과수는 길이가 3~4cm이고, 열매의 날개와 열매 너비가 비슷하다. ···············································································→ 물박달나무

8. 과수는 길이가 1~2cm이고, 열매의 날개는 열매 너비의 절반 정도다. ··········································································→ 좀자작나무

7. 가지에 선점이 없다.

9. 잎은 뒷면에 선점이 없다. ··················································································································································→ 덤불자작나무

9. 잎은 뒷면에 선점이 있다. ··············································································································································→ 백두산자작나무