陕西狼尾草Pennisetum shaanxiense S. L. Chen et Y. X. Jin
陕西狼尾草Pennisetum shaanxiense S. L. Chen et Y. X. Jin
3.陕西狼尾草（植物研究）图版113：20-24
Pennisetum shaanxiense S. L. Chen et Y. X. Jin in Bull. Bot, Res. 4 (1): 68. pl. 3. 1984.
多年生。秆直立或稍倾斜，高80-150厘米。叶鞘密生疣毛，近鞘口尤多；叶舌极短， 具长约2.5毫米纤毛；叶片线形，长30-50厘米，宽0.5-1.5厘米，两面近光滑，边缘粗糙，近基部具疣毛。圆锥花序长10-20厘米，宽1.5-2厘米（包括刚毛）；主轴密生或疏生短硬毛；总梗不明显，残留在主轴上的总梗极短或呈一束纤毛；刚毛紫色，长1-3厘米，最长者为小穗3-4倍，基部生柔毛而呈羽毛状；小穗通常单生，卵状披针形，长5-6毫米；第一颖卵形，近膜质，长约2毫米，无脉或具1脉，先端钝或啮齿状；第二颖长约为小穗1/3-1/2，先端渐尖，具1-3脉；第一小花大多雄性，罕中性，第一外稃与小穗等长，具5-7脉，内稃狭窄或缺；第二小花两性，第二外稃具5-7脉；鳞被2，楔形；雄蕊3，花药顶端无毫毛；花柱基部联合。叶片表皮细胞结构为上下表皮不同；上表皮脉间中央3-5行为筒状五角形、壁厚、有波纹长细胞，两边为长筒状、壁厚、有波纹长细胞，偶有短细胞；下表皮脉间为长筒状、壁厚、有波纹长细胞与短细胞交叉排列。花果期7-11月。
产陕西、甘肃等省；多生于海拔500-1 100米山坡路边。模式标本采自陕西略阳县。
《Flora of China》 Vol. 22 (2006)
Pennisetum shaanxiense S. L. Chen & Y. X. Jin
陕西狼尾草 shan xi lang wei cao
Pennisetum longissimum var. intermedium S. L. Chen & Y. X. Jin.
Perennial forming loose tufts. Culms ascending from a shortly decumbent rooting base, 80–150 cm tall. Lower leaf sheaths papillose-pilose especially at mouth; leaf blades linear, thin, flaccid, 30–50 × 0.5–1.8 cm, subglabrous, smooth except for papillose-pilose base, margins scabrous; ligule ca. 2.5 mm. Inflorescence linear, 10–20 × 1.5–2 cm; axis densely hispidulous with angular ribs, peduncle stumps crowded, very short with a tuft of spiculae; involucre narrow, ascending, enclosing 1 spikelet; bristles purple, stiff, glabrous or inner thinly plumose in the lower part, unequal with one much longer than rest, longest 1.5–2.5 cm. Spikelet ovate-lanceolate, 5–6 mm; lower glume ovate, submembranous, ca. 2 mm, 1-veined or veinless, obtuse or erose; upper glume 1/3–1/2 as long as spikelet, 1–3-veined, acuminate; lower floret neuter, lemma as long as spikelet, 5–7-veined, palea small or absent; upper lemma 5–7-veined; anthers without hairs at tip. Fl. and fr. Jul–Nov.
* Mountain slopes, roadsides, field margins; 500–1100 m. Gansu, Hunan, Qinghai, Shaanxi, Sichuan, Yunnan.
This species is variable in the hairiness of the involucral bristles, which are never more than thinly hairy, and the hairs may be confined to the stout, longest bristle, or even absent altogether. The species can be recognized by its thin, flat leaves with papillose-pilose lower sheaths, hispidulous rachis, narrow involucres of stiff bristles, and empty lower lemma.
科名：禾本科 Gramineae
属名：狼尾草属 Pennisetum
3.陕西狼尾草（植物研究）图版113：20-24
Pennisetum shaanxiense S. L. Chen et Y. X. Jin in Bull. Bot, Res. 4 (1): 68. pl. 3. 1984.
多年生。秆直立或稍倾斜，高80-150厘米。叶鞘密生疣毛，近鞘口尤多；叶舌极短， 具长约2.5毫米纤毛；叶片线形，长30-50厘米，宽0.5-1.5厘米，两面近光滑，边缘粗糙，近基部具疣毛。圆锥花序长10-20厘米，宽1.5-2厘米（包括刚毛）；主轴密生或疏生短硬毛；总梗不明显，残留在主轴上的总梗极短或呈一束纤毛；刚毛紫色，长1-3厘米，最长者为小穗3-4倍，基部生柔毛而呈羽毛状；小穗通常单生，卵状披针形，长5-6毫米；第一颖卵形，近膜质，长约2毫米，无脉或具1脉，先端钝或啮齿状；第二颖长约为小穗1/3-1/2，先端渐尖，具1-3脉；第一小花大多雄性，罕中性，第一外稃与小穗等长，具5-7脉，内稃狭窄或缺；第二小花两性，第二外稃具5-7脉；鳞被2，楔形；雄蕊3，花药顶端无毫毛；花柱基部联合。叶片表皮细胞结构为上下表皮不同；上表皮脉间中央3-5行为筒状五角形、壁厚、有波纹长细胞，两边为长筒状、壁厚、有波纹长细胞，偶有短细胞；下表皮脉间为长筒状、壁厚、有波纹长细胞与短细胞交叉排列。花果期7-11月。
产陕西、甘肃等省；多生于海拔500-1 100米山坡路边。模式标本采自陕西略阳县。
《Flora of China》 Vol. 22 (2006)
Pennisetum shaanxiense S. L. Chen & Y. X. Jin
陕西狼尾草 shan xi lang wei cao
Pennisetum longissimum var. intermedium S. L. Chen & Y. X. Jin.
Perennial forming loose tufts. Culms ascending from a shortly decumbent rooting base, 80–150 cm tall. Lower leaf sheaths papillose-pilose especially at mouth; leaf blades linear, thin, flaccid, 30–50 × 0.5–1.8 cm, subglabrous, smooth except for papillose-pilose base, margins scabrous; ligule ca. 2.5 mm. Inflorescence linear, 10–20 × 1.5–2 cm; axis densely hispidulous with angular ribs, peduncle stumps crowded, very short with a tuft of spiculae; involucre narrow, ascending, enclosing 1 spikelet; bristles purple, stiff, glabrous or inner thinly plumose in the lower part, unequal with one much longer than rest, longest 1.5–2.5 cm. Spikelet ovate-lanceolate, 5–6 mm; lower glume ovate, submembranous, ca. 2 mm, 1-veined or veinless, obtuse or erose; upper glume 1/3–1/2 as long as spikelet, 1–3-veined, acuminate; lower floret neuter, lemma as long as spikelet, 5–7-veined, palea small or absent; upper lemma 5–7-veined; anthers without hairs at tip. Fl. and fr. Jul–Nov.
* Mountain slopes, roadsides, field margins; 500–1100 m. Gansu, Hunan, Qinghai, Shaanxi, Sichuan, Yunnan.
This species is variable in the hairiness of the involucral bristles, which are never more than thinly hairy, and the hairs may be confined to the stout, longest bristle, or even absent altogether. The species can be recognized by its thin, flat leaves with papillose-pilose lower sheaths, hispidulous rachis, narrow involucres of stiff bristles, and empty lower lemma.