Kingdom/Regno: Plantae (Plants/Piante)
Subkingdom/Sottoregno: Tracheobionta (Vascular plants/Piante vascolari)
Superdivision/Superdivisione: Spermatophyta (Seed plants/Piante con semi)
Division/Divisione: Magnoliophyta (Flowering plants/Piante con fiori)
Class/Classe: Magnoliopsida (Dicotyledons/Dicotiledoni)
Subclass/Sottoclasse: Asteridae
Order/Ordine: Lamiales
Family/Famiglia: Lamiaceae (Mint family)
Genus/Genere: Pycnanthemum Michx.

Species/Specie:
1) Pycnanthemum alatum Raf. [Fl. ludov. 40. 1817] (= Hyptis alata (Raf.) Shinners)
2) Pycnanthemum albescens Torr. & A. Gray [Amer. J. Sci. Arts 42:45. 1842] Whiteleaf mountain mint
3) Pycnanthemum beadlei (Small) Fernald [Rhodora 39:446. 1937] (= Koellia beadlei Small)
4) Pycnanthemum californicum Torr. ex Durand [J. Acad. Nat. Sci. Philadelphia ser. 2, 3:99. 1855] Sierra mint
5) Pycnanthemum curvipes (Greene) E. Grant & Epling [Univ. Calif. Publ. Bot. 20:209. 1943] (= Koellia curvipes Greene)
6) Pycnanthemum flexuosum (Walter) Britton et al. [Prelim. cat. 42. 1888] (= Pycnanthemum hyssopifolium Benth.) Mountain mint
7) Pycnanthemum floridanum E. Grant & Epling [Univ. Calif. Publ. Bot. 20:209. 1943] Florida mountain-mint
8) Pycnanthemum hybrid
9) Pycnanthemum hyssopifolium Benth. [Labiat. gen. spec. 329. 1834] (= Pycnanthemum flexuosum (Walter) Britton et al.)
10) Pycnanthemum incanum Michx. [Fl. bor.-amer. 2:7. 1803] Hoary mountain mint
11) Pycnanthemum loomisii Nutt. [J. Acad. Nat. Sci. Philadelphia 7:100. 1834] Loomis' mountain-mint
12) Pycnanthemum montanum Michx. [Fl. bor.-amer. 2:8. 1803] Thinleaf mountainmint
13) Pycnanthemum muticum (Michx.) Pers. [Syn. pl. 2(1):128. 1806] (= Brachystemum muticum Michx.) Mountain mint
14) Pycnanthemum pilosum Nutt. [Gen. N. Amer. pl. 2:33. 1818] Mountain mint
15) Pycnanthemum pycnanthemoides (Leavenw.) Fernald [Rhodora 10:86. 1908] (= Tullia pycnanthemoides Leavenw.) Southern mountain-mint
16) Pycnanthemum setosum Nutt. [J. Acad. Nat. Sci. Philadelphia 7:100. 1834] Awned mountain-mint
17) Pycnanthemum tenuifolium Schrad. [Hort. gott. 10. 1809] Narrowleaf mountainmint
18) Pycnanthemum torrei Benth. [Labiat. gen. spec. 329. 1834] Torrey's mountain-mint
19) Pycnanthemum verticillatum (Michx.) Pers. [Syn. pl. 2(1):128. 1806] (= Brachystemum verticillatum Michx.) Whorled mountain-mint
20) Pycnanthemum virginianum (L.) T. Durand & B. D. Jacks. ex B. L. Rob. & Fernald [A. Gray, Manual ed. 7:707. 1908] (= Satureja virginiana L.) Virginia mountain mint

Kingdom/Regno: Plantae (Plants/Piante)
Subkingdom/Sottoregno: Tracheobionta (Vascular plants/Piante vascolari)
Superdivision/Superdivisione: Spermatophyta (Seed plants/Piante con semi)
Division/Divisione: Magnoliophyta (Flowering plants/Piante con fiori)
Class/Classe: Magnoliopsida (Dicotyledons/Dicotiledoni)
Subclass/Sottoclasse: Magnoliidae
Order/Ordine: Magnoliales
Family/Famiglia: Myristicaceae
Genus/Genere: Pycnanthus Warb.

Species/Specie:
1) Pycnanthus angolensis (Welw.) Warb. [Notizbl. Königl. Bot. Gart. Berlin 1:100. 1895] (= Myristica kombo Baill.) (= Pycnanthus kombo (Baill.) Warb.) Ilomba
2) Pycnanthus kombo (Baill.) Warb. [Nova Acta Acad. Caes. Leop.-Carol. German. Nat. Cur. 68:252. 1897] (= Myristica kombo Baill.) (= Pycnanthus angolensis (Welw.) Warb.)

Kingdom/Regno: Plantae (Plants/Piante)
Subkingdom/Sottoregno: Tracheobionta (Vascular plants/Piante vascolari)
Superdivision/Superdivisione: Spermatophyta (Seed plants/Piante con semi)
Division/Divisione: Magnoliophyta (Flowering plants/Piante con fiori)
Class/Classe: Liliopsida (Monocotyledons/Monocotiledoni)
Subclass/Sottoclasse: Arecidae
Order/Ordine: Arales
Family/Famiglia: Araceae
Genus/Genere: Pycnospatha Thorel ex Gagnep.

Species/Specie:
1) Pycnospatha arietina Gagnep. [Bull. Soc. Bot. France 88:512. 1941]
2) Pycnospatha palmata Gagnep. [Bull. Soc. Bot. France 88:511. 1941]

Kingdom/Regno: Plantae (Plants/Piante)
Subkingdom/Sottoregno: Tracheobionta (Vascular plants/Piante vascolari)
Superdivision/Superdivisione: Spermatophyta (Seed plants/Piante con semi)
Division/Divisione: Magnoliophyta (Flowering plants/Piante con fiori)
Class/Classe: Magnoliopsida (Dicotyledons/Dicotiledoni)
Subclass/Sottoclasse: Rosidae
Order/Ordine: Fabales
Family/Famiglia: Fabaceae (Pea family)
Genus/Genere: Pycnospora R. Br. ex Wight & Arn.

Species/Specie:
1) Pycnospora hedysaroides R. Br. ex Baker [J. D. Hooker, Fl. Brit. India 2:153. 1876] (= Hedysarum lutescens Poir.) (= Pycnospora lutescens (Poir.) Schindl.)
2) Pycnospora lutescens (Poir.) Schindl. [J. Bot. 64:145. 1926] (= Hedysarum lutescens Poir.) (= Pycnospora hedysaroides R. Br. ex Baker)

Kingdom/Regno: Plantae (Plants/Piante)
Subkingdom/Sottoregno: Tracheobionta (Vascular plants/Piante vascolari)
Superdivision/Superdivisione: Spermatophyta (Seed plants/Piante con semi)
Division/Divisione: Magnoliophyta (Flowering plants/Piante con fiori)
Class/Classe: Magnoliopsida (Dicotyledons/Dicotiledoni)
Subclass/Sottoclasse: Asteridae
Order/Ordine: Lamiales
Family/Famiglia: Lamiaceae (Mint family)
Genus/Genere: Pycnostachys Hook.

Species/Specie:
1) Pycnostachys urticifolia Hook. [Bot. Mag. 89: t. 5365. 1863]

Kingdom/Regno: Plantae (Plants/Piante)
Subkingdom/Sottoregno: Tracheobionta (Vascular plants/Piante vascolari)
Superdivision/Superdivisione: Spermatophyta (Seed plants/Piante con semi)
Division/Divisione: Magnoliophyta (Flowering plants/Piante con fiori)
Class/Classe: Liliopsida (Monocotyledons/Monocotiledoni)
Subclass/Sottoclasse: Commelinidae
Order/Ordine: Cyperales
Family/Famiglia: Cyperaceae (Sedge family)
Genus/Genere: Pycreus P. Beauv.

Species/Specie:
1) Pycreus flavidus (Retz.) T. Koyama [J. Jap. Bot. 51:316. 1976] (= Cyperus flavidus Retz.)
2) Pycreus niger (Ruiz & Pav.) Cufod. [Bull. Jard. Bot. État 40(suppl.):1443. 1970] (= Cyperus niger Ruiz & Pav.)
3) Pycreus polystachyos (Rottb.) P. Beauv. [Fl. Oware 2:48, t. 86. 1807] (= Cyperus polystachyos Rottb.) Bunchy flat sedge
4) Pycreus sanguinolentus (Vahl) Nees [Linnaea 9:283. 1835, nom. cons. (ex C. B. Clarke in Hook. f., Fl. Brit. India 6:590. 1893)] (= Cyperus louisianensis Thieret) (= Cyperus sanguinolentus Vahl)