A synopsis of the genus Stryphnodendron (Fabaceae, Caesalpinioideae, mimosoid clade) Author Scalon, Viviane Renata 0000-0001-7000-6641 Universidade Federal de Ouro Preto, Herbário OUPR. Campus Morro do Cruzeiro s. n., 35400 - 000, Ouro Preto / MG, Brazil. vrscalon @ gmail. com; https: // orcid. org / 0000 - 0001 - 7000 - 6641 vrscalon@gmail.com Author Paula-Souza, Juliana De Universidade Federal de Santa Catarina, Departamento de Botânica / CCB. Rua Eng. Agronômico Andrei Cristian Ferreira 216, 88040 - 535, Florianópolis / SC, Brazil. Author Lima, Alexandre Gibau De Universidade de São Paulo, ESALQ. Av. Pádua Dias 11, 13418 - 900, Piracicaba / SP, Brazil. & Escola Nacional de Botânica Tropical, Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 2040, 22460 - 030, Rio de Janeiro / RJ, Brazil. alegibau @ gmail. com. Author Souza, Vinicius Castro Universidade de São Paulo, ESALQ. Av. Pádua Dias 11, 13418 - 900, Piracicaba / SP, Brazil. text Phytotaxa 2022 2022-05-03 544 3 227 279 http://dx.doi.org/10.11646/phytotaxa.544.3.1 journal article 55680 10.11646/phytotaxa.544.3.1 f125f93d-3a5b-48a3-9561-4ebee258e3d6 1179-3163 6520280 13. Stryphnodendron gracile Heringer & Rizzini (1966: 105) . — Type : BRAZIL . Minas Gerais , Serra do Cipó , 12 November 1959 , Heringer 7361 ( lectotype RB00584092 !, designated here, isolectotypes NY!, UB !) Subshrubs 30–50 cm tall, usually cespitose, bearing a well-developed, woody underground root-like system, very rarely shrubs to 2 m tall. Leaves with (4–)5–8(–9) pairs of pinnae; (5–)7–12 pairs of leaflets; rachis nectaries 4, patelliform; blade chartaceous, margin glabrous, leaflets (6–)8–14(–18) × (2–)4–6(–9) mm, discolor, glabrous on both surfaces, unilateral tuft of trichomes on the lower surface absent. Inflorescences of simple thyrsi; cymulae of usually solitary spikes, sometimes geminate, rarely ternate, vinaceous to reddish. Flowers monoclinous or diclinous, vinaceous. Fruit a follicule, straight, flat-compressed, 6.5–9.5(–11) × 1.5–1.9 cm , valves atrovinaceous to dark-brown. Nomenclatural Notes: —Heringer & Rizzini (1966) indicated two syntypes for S. gracile , both deposited in RB (RB118804/ Rizzini s.n. and RB121073/ E.P. Heringer 7361). The gathering selected by us as lectotype ( Heringer 7361, barcode RB00584092 !) is mounted in two separate sheets, and the one bearing the label corresponds to the lectotype . Distribution and habitat: —This species occurs on slopes and rocky outcrops, campos rupestres and high altitude campos cerrados of the Serra do Cipó, Minas Gerais state , usually in shallow and rocky soils. The collection Glaziou 14649 reportedly gathered in Barbacena ( Minas Gerais ) corresponds to a mixed set of S. cristalinae (P) and S. adstringens (G, P and R), thus the distribution of the taxon is still considered restricted to the site of the type collection. Conservation :—Endangered (EN B1ab(i,ii,iii,iv)+2ab(i,ii,iii,iv)) [AOO= 16.000 km 2 , EOO= 279.553 km 2 ]. Although there are registers of this species in conservation units, its distribution area is very reduced and there are indications that it forms small populations. Phenology: —This species was collected with flowers from March to June and from September to December, while specimens with fruits were collected in February, April and May. Selected specimens examined: — BRAZIL . Minas Gerais : Jaboticatubas , Serra do Cipó , km 113, ao longo da Rodovia Lagoa Santa – Conceição do Mato Dentro – Diamantina , 15 April 1972 , fr., A.B. Joly et al CFSC1534 ( SP ). Santana do Riacho , Serra do Cipó , 24 October 1974 , fl., G. Hatschbach 35285 ( MBM , UEC ) .