TABLE 1 in Mammillaria monochrysacantha (Cactaceae), a new endemic species from Guanajuato, Mexico

TABLE 1. Morphological comparison among species of Mammillaria with hair-like radial spines in Guanajuato, Querétaro, and San Luis Potosí. Mammillaria bocasanaMammillaria crinitaMammillaria monochrysacanthaMammillaria scheinvarianaMammillaria schwarziiStem length × diameter (cm)6 × 3–52.5 × 3.54 × 52–4 × 63.8 × 3.2Number of radial spines25–3016–2628–3220–2435–40Number of central spines1–42–410–(1)5–9Radial spine vestitureGlabrousPubescentGlabrousGlabrousGlabrousFlower length × diameter (mm)15–22 × 15–2015 × 1514–15 × 9–1217–18 × 1015 × 12Tepals colorWhite to pale pink inner and outer tepals with brown middle stripeWhite to pale yellow inner and outer tepals with brown middle stripePale yellow inner and outer tepals with pale brown middle stripeWhite inner and outer tepals with pale pink middle stripeWhite inner and outer tepals with pale brown middle stripeArilloidPresentPresentAbsentAbsentAbsentDistributionSan Luis PotosíHidalgo, Querétaro, and GuanajuatoGuanajuatoQuerétaroGuanajuatoHabitatXerophytic scrub, 1750–2300 m elev., on humus and floors of igneous rocksXerophytic scrub to oak forest, 1900–2200 m elev., on floors of igneous rocksTropical deciduous forest, 1300– 1400 m elev., on igneous cliffsTropical deciduous forest, 1500–1700 m elev., on igneous cliffsEcotone of xerophytic scrub and oak forest, 2250–2350 m elev., on igneous cliffs表1. 瓜纳华托州、克雷塔罗州与圣路易斯波托西州具毛发状放射刺的乳突球属（Mammillaria）物种形态学比较 乳突球属物种 茎长×直径（cm） 放射刺数目 中刺数目 放射刺被覆物 花长×直径（mm） 花被片色泽 假种皮 分布范围 生境 波卡乳突球（Mammillaria bocasana） 6 × 3–5 25–30 1–4 无毛 15–22 × 15–20 内外花被片白色至淡粉色，具棕色中条纹 存在 圣路易斯波托西州 旱生灌丛，海拔1750–2300 m，生于腐殖质层与火成岩岩面 毛乳突球（Mammillaria crinita） 2.5 × 3.5 16–26 2–4 被短柔毛 15 × 15 内外花被片白色至淡黄色，具棕色中条纹 存在 伊达尔戈州、克雷塔罗州与瓜纳华托州 旱生灌丛至栎林，海拔1900–2200 m，生于火成岩岩面 单金刺乳突球（Mammillaria monochrysacantha） 4 × 5 28–32 10–(1) 无毛 14–15 × 9–12 内外花被片淡黄色，具淡棕色中条纹 缺失 瓜纳华托州 热带落叶林，海拔1300–1400 m，生于火成岩峭壁 沙因瓦里乳突球（Mammillaria scheinvariana） 2–4 × 6 20–24 5–9 无毛 17–18 × 10 内外花被片白色，具淡粉色中条纹 缺失 克雷塔罗州 热带落叶林，海拔1500–1700 m，生于火成岩峭壁 施瓦茨乳突球（Mammillaria schwarzii） 3.8 × 3.2 35–40 无毛 15 × 12 内外花被片白色，具淡棕色中条纹 缺失 瓜纳华托州 旱生灌丛与栎林交错带，海拔2250–2350 m，生于火成岩峭壁