Kurt Krause, who began working with Engler at the Berlin Botanical Garden on January 1, 1905, described two additional species before preparing his revision of Philodendron for Das Pflanzenreich (Krause, 1913). The latter remains the most recent revision of the whole genus. Krause's revision is a slightly reworked version of Engler's 1899 revision but did include the description of a new section, P. sect. Camptogynium, with a single species in P. subg. Euphilodendron and included 55 more species. There were 32 other new species published in P. subg. Philodendron. Six of these were in P. sect. Pteromischum (P. subg. Pteromischum) while one was in P. subg. Meconostigma. The remaining 25 were in P. subg. Euphilodendron (now Philodendron). Most were members of P. sect. Baursia and P. sect. Polyspermium (Philodendron) with a single species each in the following sections: Oligospermium (Calostigma), Schizoplacium, Macrolonchium; and three species in P. sect. Polytomium). Only two species, P. grandipes K. Krause and P. panamense K. Krause (both in current P. sect. Philodendron) were from Central America. Krause's treatment of the P. subg. Philodendron included the following sections and species for Central America (or at least now known from Central America):
Names used by Krause Current status
2. P. sect. Baursia Reichb.
39. P. wendlandii Schott3. P. sect. Polyspermium Engl.:
70. P. pterotum K. Koch4. P. sect. Oligospermium Schott:
67. P. coerulescens Engl., (member of P. subg. Pteromischum mistakenly placed here)
77. P. grandipes K. Krause
90. P. purpureoviride Engl. (reported for Ecuador)
95. P. scandens K. Koch & Sello = P. hederaceum
96. P. oxycardium Schott (= P. hederaceum ssp.oxycardium)
99. P. micans (Klotzsch) K. Koch = P. hederaceum ssp.hederaceum forma micans
108. P. schottianum Wendl. ex Schott
110. P. panamense K. Krause
117. P. gracile Schott = P. tenue K. Koch
116. P. tenue K. Koch
125. P. verrucosum Mathieu ex Schott
134. P. sagittifolium Liebm.5. P. sect. Tritomophyllum Schott:
140. P. sanguineum Regel = P. sagittifolium Liebm.
147. P. mexicanum Engl.
150. P. ligulatum Schott
164. P. subovatum Schott = P. sagittifolium Liebm.
168. P. smithii Engl.
173. P. advena Schott
176. P. pittieri Engl. = P. hederaceum (Jacq.) Schott
181. P. fenzlii Engl. = P. tripartitum (Jacq.) Schott6. P. sect. Schizophyllum Schott: (no species represented)
182. P. anisotomum Schott
183. P. tripartitum (Jacq.) Schott
[P.pedatum (Hook.) Kunth was reported by John Hall of Costa Rica but no live or dried material is available for confirmation.7. P. sect. Polytomium Schott:
195. P. radiatum Schott8. P. sect. Macrolonchium Schott
198. P. augustinum K. Koch = P. radiatum Schott
199. P. polytomum Schott = P. radiatum Schott
200. P. warszewiczii K. Koch
202. P. fragrantissimum (Hook.) Kunth9. P. sect. Macrogynium Engl.:
207. P. hoffmannii Schott sensu Engl. = P. jacquinii Schott10. P. sect. Camptogynium K. Krause: (no species represented)
Note: Species numbers refer to those in Krause's revision.
The 28 Central American species names for Philodendron subg. Philodendron represented only 11 percent of the 222 species in Krause's revision. Of the 28 taxa Krause reported for Central America, P. coerulescens was a member of P. subg. Pteromischum, ten are now considered synonyms of other Central American species which he also reported or which have been subsumed into other species as varieties or subspecies. Of the ten, two, P. tenue and P. jacquinii, have been given older names which he did not report but still represent Central American species. Thus, Krause's revision of the Philodendron of Central America treated only 19 species, roughly 1/5 of the total currently known for Central America. One additional Central American species, P. purpureoviride, was treated by Krause but not reported for Central America.