Key to the genera of Moraceae in Vietnam This key presented applies to the native and naturalized general of Vietnam and follows recent taxonomic revisions in Moraceae. Previously-accepted genera are given in brackets. For genera represented only by one species, the species name is given in parentheses. 1a. Plants woody ...................................................................................................................................................................................... 2 1b. Plants not woody ................................................................................................................................................................................ 3 2a. Plants herbaceous or subshrubs, without latex; inflorescences cymose or spicate; stamens 4 ............................. Fatoua (F. villosa) 2b. Plants herbaceous or succulent, within latex; inflorescences discoid to turbinate; stamens 2 or 3 (introduced)................................. .................................................................................................................................................................. Dorstenia (D. contrajerva) 3a. Inflorescences urceolate (figs) stigmas and anthers not exposed at anthesis; leaves usually trinerved at the base; lamina with waxy glandular spots at the base of the midrib or in the axils of the basal lateral veins beneath........................................................ Ficus 3b. Inflorescences not urceolate, stigmas and anthers exposed at anthesis; leaves seldom trinerved at the base; lamina usually without waxy glandular spots .......................................................................................................................................................................... 4 4a. Staminate inflorescence capitate with at least a rudimentary involucre; stipules lateral ................................................................... 5 4b. Inflorescences not involucrate; stipules lateral or fully amplexicaul ................................................................................................. 6 5a. Leaves distichous, involucral bracts imbrivate, pistillate flowers one per inflorescence, stamens straight or inflexed in bud ........... ............................................................................................................................................................................................................ 7 5b. Leaves spirally arranged; involucral bracts not imbricate; pistillate inflorescences multiflorous, with flowers embedded in the receptacle; stamens straight in bud................................................................................................................... Hullettia (H. dumosa) 6a. Inflorescences bisexual; staminate flowers numerous, surrounding 1-2 central pistillate flowers; (introduced) Brosimum (B. utile) 6b. Inflorescences unisexual..................................................................................................................................................................... 8 7a. Inflorescences always unisexual, pistillate inflorescences involucrate; staminate inflorescences discoid with a well-developed involucre; stamens straight in bud; with self-pruning branches....................................................................... Antiaris (A. toxicaria) 7b. Inflorescences sometimes bisexual, pistillate inflorescences not involucrate; staminate inflorescences capitate with a rudimentary involucre; stamens inflexed in bud; without self-pruning branches................................................ Streblus [Streblus sect. Streblus] 8a. Stamens one per flower, straight in bud; pistillate flowers at least partially connate ....................................................... Artocarpus 8b. Stamens 4‒5 per flower, inflexed in bud; pistillate flowers free, or if connate, the plants armed with spines ................................. 9 9a. Plants armed with curved or straight spines; staminate and pistillate inflorescences globose-capitate and multiflorous; tepals and bracts mostly with yellow dye accumulated in immersed glands ........................................................................................ Maclura 9b. Plants unarmed, or if armed, then with straights spines; staminate inflorescences not globose-capitate or pistillate inflorescences not multiflorous, tepals and bracts without yellow dye containing glands ..................................................................................... 10 10a. Plants climbers ................................................................................................................................................................................. 11 10b. Plants trees or shrubs ....................................................................................................................................................................... 12 11a. Plants deciduous; lamina chartaceous, leaf margin crenate to serrate-dentate; pistillate inflorescences globose................................ ................................................................................................................... Allaeanthus [Broussonetia sect. Allaeanthus] (A. kurzii) 11b. Plants evegreen; lamina subcoriaceous, leaf margin entire or denticulate towards the apex; pistillate inflorescences capitate but not globose.................................................................................................................... Malaisia [Trophis sect. Malaisia] (M. scandens) 12a. Staminate flowers 5-parted; leaf margin entire ..................................... Pseudostreblus [Streblus sect. Pseudostreblus] (P. indicus) 12b. Staminate flower 4-parted; leaf margin toothed at least toward the apex ........................................................................................ 13 13a. Leaves distichous, spirally arranged, or subopposite: shoot apices shed, just above the upper lateral, scaled resting-bud thorns always absent; pistillate inflorescences spicate or globose, multiflorous ........................................................................................ 14 13b. Leaves distichous; shoot apices persistent, thorns usually present, axillary or terminating short shoots; pistillate inflorescences uniflorous to racemose ........................................................................................................ Taxotrophis [Streblus sect. Taxotrophis] 14a. Leaves distichous; pistillate inflorescences spicate; tepals of the pistillate flowers free; stigmas 2 equal ............................... Morus 14b. Leaves spirally arranged or subopposite; pistillate inflorescences globose; tepals of the pistillate flowers connate; stigma 1, or if 2, then unequal ........................................................................................................................................... Broussonetia (B. papyrifera)

Published as part of Bui, Van Huong, Vu, Dinh Duy, Pham, Mai Huong, Do, Van Hai, Doan, Hoang Son, Bui, Van Thanh, Dam, Ngoc Anh Luu, Truong, Ba Vuong & Gardner, Elliot M., 2022, HULLETTIA King ex Hook. f. (Moraceae), A newly recorded genus to the Flora of Vietnam, with its lectotypification and a revised key to Vietnamese Moraceae, pp. 272-278 in Phytotaxa 550 (3) on pages 276-277, DOI: 10.11646/phytotaxa.550.3.7, http://zenodo.org/record/6651048