討論:鼠麴草屬

山羊百科，林文智老師的植物、山岳、攝影紀錄

1. 頭花繖房狀排列；總苞片亮黃色、淺黃色或乳白色。

2. 總苞淺黃色或乳白色。

3. 主莖粗壯的草本，植株高50-120 cm；葉寬1-2 cm；頭花直徑6-8 mm..................................... 1. G. adnatum

3. 柔弱的草本，植株高10-50 cm；葉寬0.1-1 cm；頭花直徑約3 mm............. 6a. G. luteoalbum subsp. luteoalbum

2. 總苞亮黃色。

4. 葉兩面同色，被白色綿毛；花柱較花冠筒短... 6b. G. luteoalbum subsp. affine

4. 葉兩面不同色；花柱較花冠筒長。

5. 葉上表面無毛或被短捲毛，下表面密被白色綿毛..................................3a. G. hypoleucum var. hypoleucum

5. 葉兩面密被白色綿毛............................................. 3b. G. hypoleucum var. amoyense

1. 頭花穗狀、圓錐狀或密生的繖房狀排列；總苞片稻草色、淡褐色或先端略帶紅紫色。

6. 基生葉開花時不枯萎，若枯萎則宿存。

7. 頭花簇生為緊密的繖房花序或近似於頭狀花序；基生葉線形或窄橢圓形..............................5. G. japonicum

7. 頭花穗狀或圓錐狀排列；基生葉長橢圓形、倒披針形或匙形。

8. 植株不高於35 cm；葉上表面被鬆散的白色綿毛，中肋不向下凹陷..................................... 8. G. pupureum

8. 植株高可達60 cm；葉上表面綠色無毛，且兩面明顯不同色，下表面密背氈毛而呈銀灰色，中肋明顯向下凹陷成溝...................... 9. G. spicatum

6. 基生葉於開花時枯萎。

9. 頭花簇生為緊密的繖房花序或近似於頭狀花序；冠毛離生，不相連成環。

10. 莖多分枝；葉寬約5 mm；頭花腋生................. 4a. G. involucratum var. ramosum

10. 莖不分枝；葉寬2-3 mm；頭花頂生.................... 4b. G. involucratum var. simplex

9. 頭花穗狀或圓錐狀排列；冠毛基部相連成環。

11. 頭花為排列較鬆散；總苞僅基部被覆毛；葉線形或窄披針形.... 2. G. calviceps

11. 頭花排列較密；總苞被毛達總苞長的2/3；葉匙形或葉倒披針形..........................................7. G. pensylvanicum

1. Heads in corymbs; involucral bracts bright or pale yellow.

2. Involucral bracts pale yellow.

3. Robust plants, 50-100 cm tall; leaves 1-2 cm wide; heads 6-8 mm across ......... 1. G. adnatum

3. Slender plants, 10-50 cm tall; leaves 0.1-0.5 cm wide; heads ca. 3 mm across ...........6a. G. luteoalbum subsp. Luteoalbum

2. Involucral bright yellow.

4. Leaves white tomentose on both surfaces; style shorter than corolla ......... 6b. G. luteoalbum subsp. Affine

4. Leaves discolorous or white wooly on both surface; style longer than corolla.

5. Leaves short crisp pilose on upper surface 3a. G. hypoleucum var. hypoleucum

5. Leaves densely white woolly on both surface 3b. G. hypoleucum var. amoyense

1. Heads in spikes or panicles; involucral bracts stramineous, brownish or tinged purple.

6. Basal leaves persistent at anthesis.

7. Heads in compact, subcapitate cymes; basal leaves linear to narrowly elliptic 5. G. japonicum

7. Heads in spikes or panicles; basal leaves oblong, oblanceolate to spatulate.

8. Plants to 60 cm tall; upper surfaces of leaves glabrous or glabrescent, with a deep midrib furrow .........9. G. spicatum

8. Plants less than 35 cm tall; upper surface of leaves loosely white woolly, without a deep midrib furrow .........8. G. purpureum

6. Basal leaves withering at anthesis.

9. [Heads in a dense subcapitate cymes; pappus free at base.]

10. Stems much branched; leaves ca. 5 mm wide; heads in axillary cymes .........4a. G. involucratum var. ramosum

10. Stems unbranched; leaves ca. 2-3 mm wide; heads in terminal cymes .....4b. G. involucratum var. simplex

9. [Heads in spikes or panicles; pappus connate at base into a ring.]

11. Heads in loose panicles, woolly at base only 2. G. calviceps

11. Heads in spicate panicles, densely woolly to 2/3 from base 7. G. pensylvanicum