Book  (1965)  Page(s) 441.  
 
4. Clematis speciosa (Makino) Makino. C. heracleifolia var. speciosa Makino; C. heracleifolia var. hookeri Makino, excl. syn. - Ō-kusa-botan. Closely resembles No. 3 [C. stans]; stems stout; leaves chartaceous, petiolate, somewhat larger, ternate, the leaflets ovate to broadly so, 10-18 cm. long, 4-10 cm. wide, short-acuminate, sometimes 2- to 3-lobed, short-toothed, the lateral leaflets usually petioluled, prominently oblique at base; flowers 2-2.5 cm. long; sepals linear-lanceolate, dilated above; stamens about 1/3 as long as the sepals, the anthers shorter than the filaments, about 3 mm. long. - Oct. Shikoku, Kyushu.