갈매나무속 Rhamnus LINN.

1. 잎은 대생한다.

2. 잎은 길이 6cm 이상이며 넓은 난형 또는 타원형이고 대개 털이 있으며 잎자루는 길이 6-25mm이다.

3. 열매는 둥글다 ··················································································································· 1125. 갈매나무

3. 열매는 도란형이다 ········································································································· 1126. 연밥갈매나무

2. 잎은 길이 1.5-3.5cm 이며 장타원상 난형 또는 타원형이고 털이 있으며 잎자루는 길이 5-16mm 이다 ··········· 1127. 돌갈매나무

1. 잎은 호생한다.

4. 가지에 가시가 있고 겨울눈은 아린으로 싸여있다.

5. 잎은 원형 또는 타원형이다.

6. 잎은 길이 4-7cm로서 양면에 털이 있다 ················································································ 1128. 털갈매나무

6. 잎은 길이 1-2cm로서 뒷면에 털이 있고 소괴경은 길이 4-7mm이다 ·············································· 1129. 좀갈매나무

5. 잎은 타원형 또는 도란상 타원형이며 길이 3-8cm로서 보통 털이 없으며 소괴경은 길이7-20 mm 이다 ········· 1130. 짝자래나무

4. 가지에 가시가 없고 겨울눈은 나출한다 ·························································································· 1131. 산황나무