@booklet {208,
	title = {Das Pflanzenreich IV.23B. Araceae-Pothoideae. Nachter. Monsteroideae Calloideae},
	volume = {Heft 21},
	year = {1908},
	publisher = {W. Engelmann},
	author = {Engler, Heinrich Gustav Adolf and Krause, Kurt}
}
@booklet {207,
	title = {Beitr{\"a}ge zur Kenntnis der Araceae. VII. 14. Araceae novae Asiae tropicae et subtropicae},
	volume = {25},
	year = {Submitted},
	abstract = {Jan-28},
	author = {Engler, Heinrich Gustav Adolf}
}
@booklet {208,
	title = {Das Pflanzenreich IV.23B. Araceae-Pothoideae},
	volume = {Heft 21},
	year = {1905},
	publisher = {W. Engelmann},
	abstract = {1-330},
	author = {Engler, Heinrich Gustav Adolf}
}
@booklet {209,
	title = {Araceae Wiss. Erg. Deut. Zentr.-Afr. Exped., Bot.},
	volume = {2},
	year = {1910},
	abstract = {<p>55 pp.</p>
},
	author = {Engler, Heinrich Gustav Adolf}
}
