Melicope spathulata A. Gray Bot. U.S. Expl. Exped. 1: 352. 1854. Platydesma spathulatum (A. Gray) B.C. Stone, Madrono . 16: 165. 1962.

Appelhans, Marc S., Wood, Kenneth R. & Wagner, Warren L., 2017, Reduction of the Hawaiian genus Platydesma into Melicope section Pelea (Rutaceae) and notes on the monophyly of the section, PhytoKeys 91, pp. 125-137 : 131-132

Melicope spathulata A. Gray Bot. U.S. Expl. Exped. 1: 352. 1854. Platydesma spathulatum (A. Gray) B.C. Stone, Madrono. 16: 165. 1962. Fig. 4

Melicope? grandifolia A.Gray Bot. U.S. Expl. Exped. 1: 354. 1854. - Type: Hawai‘i: forests of Mauna Kea, 1840, U.S. Expl. Exped. s.n. (holotype: US-15033 [US00101457, specimen!]; isotype: GH [GH01153097, image!]).

Platydesma campanulata H. Mann, Proc. Bost. Soc. Nat. Hist. 10: 317. 1866. - Type: O‘ahu: on the mountains behind Honolulu, at middle heights, H. Mann & W. T. Brigham 94 (holotype: CU, not located; isotypes: BISH [4 sheets, BISH1016385, BISH1016386, BISH1016388, BISH1016390, specimens!], G [G00380101, image!], GH [2 sheets, GH00044158, GH00044159, images!], MASS [MASS00320396, image!], MO [MO-251520, specimen!], NY [NY00067067, specimen!], US [US00101498, specimen!]).

Platydesma campanulata f. coriaceum Rock, Indig. Trees Haw. Isl. 243. 1913. - Type: Hawai‘i: Kohala Mts., [W of] Honokanenui gorge, June 1910, J. F. Rock 8367 (holotype: BISH-586927 [BISH1016394, specimen!]; isotypes: BISH [BISH1016441, specimen!], GH [2 sheets, GH00044162, GH00044163, images!]).

Platydesma campanulata var. macrophylla Hillebr., Fl. Hawaiian Isl. 71. 1888. - Type: Kaua‘i: V. Knudsen s.n. (holotype: B-probably destroyed, fragment of holotype BISH-581799 [BISH1016383, specimen!]).

Platydesma campanulata var. pallida Hillebr., Fl. Hawaiian Isl. 71. 1888. Platydesma spathulatum var. pallidum (Hillebr.) B.C. Stone, Madroño. 16: 165. 1962. - Type: O‘ahu: Ka‘ala, Hillebrand s.n.; E. Maui, Hamakua, Lydgate s.n. (syntypes: B-destroyed); Maui: along pipe-line trail, Olinda, in dark forest, 29 July 1927, O. Degener & L. Topping 8615 (neotype [designated by Stone, J. Arnold Arbor. 43: 420. 1962]: BISH-68071 [BISH1016379, specimen!]; isoneotypes: B [B_10_0296003, image!], BH [BH000121710, image!], K [K000342164, image!], MASS [MASS00320397, image!], NY [NY02859241]).

Platydesma campanulata var. pubescens Skottsb., Acta Horti Gothob. 15: 388. 1944. Platydesma spathulatum var. pubescens (Skottsb.) B.C. Stone, Madroño. 16: 165. 1962. - Type: O‘ahu: Wai‘anae Mountains, slope of Ka‘ala, 25 September 1938, O. Selling 3710 (holotype: GB [GB-0048636, image!]; isotype: S [S08-7736, image!]).

Platydesma oahuensis H. Lév., Repert. Spec. Nov. Regni Veg. 10: 154. 1911. - Type: O‘ahu: Punalu‘u, May 1910, U. Faurie 243 (holotype: not located; isotypes: A [A00044165, image!], BM [BM000798124, image!]), P [P00639232, image!]).

Platydesma spathulatum f. kalalauense O. Deg. & I. Deg., Fl. Hawaiiensis. 7: Fam. 179. 1960. - Type: Kaua‘i: east rim of Kalalau Valley, 16 Nov 1960, O. Degener, I. Degener, & W. Cadenhead 27150 (lectotype [designated here]: US-2604492 [US00101496, specimen!]).

Platydesma spathulatum f. stonei O. Deg. & I. Deg., Fl. Hawaiiensis. 7: Fam. 179. 1960. - Type: O‘ahu: Ko‘olau range. Punalu‘u, summit of Castle trail, B.C. Stone 3551 (holotype: BISH, not located; lectotype [designated here]: fig. 2, Stone, J. Arnold Arbor. 43: 418. 1962).

Type.

Kaua‘i: mountains, 1840, U.S. Expl. Exped. s.n. (holotype: US-15031 [ US 00101445, specimen!]).

Names excluded from Platydesma

Platydesma auriculifolia (A. Gray) Hillebr., Fl. Hawaiian Isl. 72. 1888. Pelea auriculifolia A. Gray, Proc. Amer. Acad. Arts 3: 50. 1853. - Type: Hawai‘i: forests of Mauna Kea, U.S. Expl. Exped., s.n. (holotype: US-15020 [US00101488, specimen!]. [= Melicope clusiifolia (A. Gray) T.G. Hartley & B.C. Stone]. - Note: Hillebrand cited the second source of the name in Pelea by Gray (U.S. Expl. Exped., Phan. 343. 1854) and also used part of the description (fruit). Hillebrand cites among the three collections the type of Pelea auriculifolia A. Gray as well as a specimen of Platydesma (Hillebrand s.n.), and the third one can’t be located (Lydgate s.n.). So his cited collections are a mixture as is the description. This Hillebrand name must be taken as a new combination. The critical facts are: Hillebrand cited the basionym, used the same epithet, and did not exclude the holotype of the basionym. It does not matter that Hillebrand cited a later publication of the cited basionym. Since this is a pre-1953 publication, it is not mandatory to cite the original publication of the basionym.

Platydesma fauriei H. Lév., Repert. Spec. Nov. Regni Veg. 10: 153. 1911. - Type: O‘ahu: Punaliuu [ Punalu‘u], May 1910, U. Faurie 242 (Isotypes: BM [BM000994065, image!], P [P00311275, image!]. - Note: The holotype was expected to be stored at E but no specimen could be located there. [= Nothocestrum longifolium A. Gray].

Insert for existing keys to Hawaiian Rutaceae and Melicope

The identification keys included in the "Manual of the Flowering Plants of Hawaii" ( Wagner et al. 1990) need to be slightly modified in order to incorporate the taxonomic changes proposed here.

Key to the genera of Rutaceae (p. 1175 in Wagner et al. 1990)

1	Leaves simple, opposite or whorled	2. Melicope
-	Leaves pinnately compound, opposite, or alternate (2).
2	Leaves alternate; seeds not winged	3. Zanthoxylum
-	Leaves usually opposite; seeds winged	1. Flindersia

Key to the species of Pelea / Melicope (p. 1178 in Wagner et al. 1990)

1	Shrubs, shrubby trees, or with palmoid habit; flowers perfect; petals slightly imbricate; filaments nearly completely connate into a staminal tube; ovules 5-8 per carpel; fruit a subglobose or cruciate capsule, indehiscent or tardily dehiscent	use original key for Platydesma (p. 1209 in Wagner et al. 1990)
-	Trees, shrubs, or subscandent; flowers functionally unisexual (and the plants polygamous) or rarely perfect; petals valvate; stamens in 2 whorls, distinct, reduced but always present in functionally pistillate flowers, longer fertile stamens equal to or exserted from corolla; ovules 2 per carpel; fruit composed of 4 nearly distinct follicles or a 4-lobed, 4-valved, cruciate or cuboid capsule, dehiscent	use original key to species of Pelea / Melicope (p. 1178 in Wagner et al. 1990)

Figures

Figure 4. Melicope spathulata A habit with flower (Wood 15091, Kaua'i, Kohua Ridge, US) B flower, lateral view (Ishikawa 302, Kaua'i, Koke'e, US) C flower, top view (Ishikawa 302, US) D flower, longitudinal section (Ishikawa 302, Kaua'i, Koke'e, US) E fruit (Herbst & Mull 5507, Hawai'i, Ola'a, US and Takeuchi et al. 1997, O'ahu, Ko'olau Mountains, US).