TAXONOMY NYMPHAEA STUHLMANNII. 161 



When raised from seed, it sports freely into the two following forms, with 

 numerous intermediates : Form azurea Hort, with light blue flowers, sepals lacking the 

 purple shadings ; form rosea, with pink or reddish flowers, sepals green, under side of 

 leaves shaded reddish. This form appeared first with Herr L. Graebener (1887) in 

 1884 in the Botanic Garden of Carlsruhe, although the first published description was 

 by W. Siber in 1887. Graebener claims to have obtained it at will by crossing N. zan- 

 zibariensis with N. dentata, though many of the hybrid seedlings came blue. Caspary 

 did not, nqr do we, accept this theory of its origin. The experiment needs to be suc- 

 cessfully repeated, but we have not had opportunity to try it. [Cf. also Revue Horti- 

 cole, 18900, and Rev. de 1'horticult. beige et etrangere, 1890, May i (not seen).] 



Nymphaea sulfurea Gilg. (Plate XII.) 



" Rhizome stout, conical. Petioles long [38 to 46 cm.] and slender; leaves deeply 

 cordate, i. e. narrowly triangular excised ; outline broadly ovate or suborbicular, entire ; 

 subcoriaceous, glabrous, reddish above, [deep] red beneath; primary veins 6, slightly 

 prominent, outer veins sub-inconspicuous or invisible. Flowers 4.5 to 7 cm. in diam- 

 eter, deep sulphur color, sweet scented ; sepals lanceolate, acute, purple or purplish on 

 both sides, with many slightly prominent parallel nerves ; petals equaling the sepals, 

 but often a little narrower, shorter and more acute ; stamens 40 to 50, linear ; anthers 

 elongate, connective evidently elongate and dilated ; carpels 12 to 14. 



" Leaves 4.5 to 5-5 cm - ^ on S an d about as wide, the sinus being usually about i to 

 1.5 cm. deep. Sepals 2 to 3 cm. long, i to 1.5 cm. wide. The deep sulphur yellow 

 petals are 2 to 2.8 cm. long, 0.7 to 1.2 cm. wide. Anthers bright yellow." (Gilg, 1903.) 



Rhizome 6.4 to 12 or 15 cm. long, about 2.5 cm. across, only one-third of which 

 is flesh, the rest being a dense layer of black hairs ; leaf bases many, prominent ; the 

 rhizome was evidently erect but not tuberous. In the specimen at Kew the sepals 

 are copper- red outside, greenish-yellow inside. Petals 13, cadmium-yellow. 



N. sulfurea, Gilg 1903. 



DISTRIBUTION AND TYPES. Coll. H. Baum, No. 657, Jan. 17, 1900, Kunene- 

 Sambesi-Expedition, " am linken Longa Ufer bei der Imbala, Minnesera, in flachen 

 sumpfigen Graben," altitude 1,250 m., in hbb. Berlin, Kew, Delessert, Munich, British 

 Museum. Also No. 325, October, 1899, " in der Nahe des Kuebe, in einem Bache, 

 welche in einem Sumpfe entspringt und in den Kuebe miindet, nicht im Kuebe selbst," 

 altitude 1,150 m., in hbb. Delessert, Berlin; this number has larger leaves and flowers 

 and broader petals than the former, with the leaves plain reddish-brown above ; in No. 

 657 the leaves are blotched all over the upper surface with large reddish-brown blotches. 

 No. 325 is mentioned first in Gilg's text, and appears, from the color of the leaves, to 

 be especially designated in the description (our first two paragraphs are a nearly literal 

 translation) ; in case of separation of the forms, No. 325 would have to stand as the type. 



Nymphaea stuhlmannii (Schw.) Gilg. (Fig. 62.) 



Sepals yellowish green, petals bright sulphur yellow, stamens orange yellow, with 

 sulphur yellow anther. Stigma orange. Receptacle brown. 



N. lotus var. stuhlmannii, Schweinfurth in Engler 1895. 

 N. stuhlmannii, Gilg 1903. 

 13 



