notes on the genus mimosa in mexico and central america

Notes on the Genus Mimosa in Mexico and Central AmericaAuthor(s): B. L. RobinsonSource: Contributions from the Gray Herbarium of Harvard University, No. 27 (1904), pp.257-261Published by: Harvard University HerbariaStable URL: http://www.jstor.org/stable/41763827 .

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ROBINSON: CONTRIBUTIONS FROM GRAY HERBARIUM. 257

-* * * Capitula plus minusve pedicellata in panicula cymosa vel eorymbosa vel (in M. hirsutissima) obscure racemosa disposita.

-i- Caulis fulvo hirsutissimus ; capitula in apicibus paniculae ramorum subracemosa.

8. M. hirsutissima, DC., Prodr., v, 200 (1836). - On mountains, Velirla of Copey, alt. 1800-1900 m., April, 1898, Ad. Tonduz , no. 12,208. A South American species.

-t- H- Caulis plus minusve pubescens, vel tomentosus, vel subglaber ; capitula cymosa vel eorymbosa.

++ Capitula 8-10 mm. longa. = Folia basi acuta vel acuminata.

9. M. olivácea, Klatt, I. c., xxxi, pt. 1, 195 (1892). Foliis integerrimis. - In woods, Buenos Aires (Costa Rica), January, 1892, alt. 200-300 m., H. Pittier , no. 4933. This species is scarcely distinct from M. Guaco , HBK.

= = Folia basi cordata.

10. M. CORDIFOLIA, Willd., Spec, pl., iii, 1746 (1804). Agua Caliente, H. Pittier , no. 137 ; in underbrush, Surubres near San Mateo, P. Biolley , no. 7025 ; Ujarras, Buenos Aires (Costa Rica), H. Pittier , no. 10,626 ; and at Navarro, Prov. Cartego, J. D. Smith , no. 4855. Widely distributed in the tropics of the New World.

++ ++ Capitula minora, 5-6 mm. longa.

11. M. Scandens, Willd., I . c., 1743 (1804). Foliis variabilibus sed semper tenuibus saepissime hastato-cordatis. - Costa Rica : H. Pittier , no. 3231 ; Ad. Tonduz , nos. 7067, 7264, 8589; P. Biolley , no. 7425. The commonest and most widely distributed species of the genus.

3. Notes on the Genus Mimosa in Mexico and Central America.

Mimosa argillotropha, spec. nov. Frutex, ramis gracilibus obscure puberulis striatis atro purpureis aculeatissimis, aculéis parvis seriatim orientibus valde recurvatis peracutis 2 mm. longis ; petiolis



258 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY.

propriis circa 1.4 cm. longis et rhachidibus foliorum 4-5 cm. longis aculéis minoribus recurvatis armatis ; pinnis 5-jugis 3-4 cm. longis in rhachillis aculéis minimis armatis; foliolie 9-11-jugis oblongis y el obovato-oblongis obtusis acute mucronulatis utrinque obscure adpresse puberulis uninervatis integerrimis circa 7 mm. longis,. stipulis subulato-filiformibus integris ; capitulis numerosis globosis in panicula pyramidata racemosa dispositis circa 6 mm. diametro (staminibus patentibus exclusis), ramulis pedicellisque inflores- centiae adpresse puberulis; floribus albis glabris, calyce 0.7 mm. longo leviter denticulato, corolla 3 mm. longa ad mediam 5-den- tata, dentibus ovatis subacuminatis ; staminibus 7-8 ; ovario sub- sessile margine hispido-piloso, fructu ignoto. - M, sepiaria , Micheli,. Leguminosae Langlasseanae, 279, not Benth. - Mexico: in clayey soil at La Correa, Guerrero, alt. 50 m., 4 October, 1898, E' Langlassé , no. 415 (type in hb. Gr.).

M. sepiaria , Benth., a Brazilian species, is widely different. It has few scattered strong spines and very numerous linear leaflets (20 to 40 pairs on each pinna).

M. colimensis, speč. nov. Verisimiliter suffrutescens, caule obtuse angulato glabro armato, aculéis brevibus crassiusculis peracutis valde compressis ; foliis 2 dm. longis (petiolo incluso), pinnis 15- 18-jugis 4-5 cm. longis foliolis 27-32-jugis lineari-oblongis acuti» 4 mm. longis 1 mm. latis basi valde obliquis stibtus sparse puberulis- nervo medio eccentrico, stipulis subulato-filiformibus 1-1.5 mm. longis erectis vix induratis, stipellis subulatis 1-1.5 mm. longis,. rhachide principali 1.5 dm. longo supra puberulo subtus aculéis parvis recurvatis munito, rhachidibus secundariis inarmatis ; inflores- centia magna pyramidali racemoso-paniculata infra folioso-bracteatay pedicellis fasciculatis filiformibus 1-1.8 cm. longis puberulis; floribu» capitatis glabris, capitulis primum ovalibus deinde subglobosis, calyce perbrevi subtruncato cuspidato-denticulato ; corolla 2 mm. longa glabra tenui dentibus acutiusculis ; fructu ignoto. - Mexico : Colima, Dr . Edward Palmer , 1897, no. 128 (type specimens in hb* Gr. and hb. IT. S. nat. mus.).

This species differs from M. eury carpa and M. eurycarpoidesy Robinson, in its more numerous pinnae, armed rhachises, and to some extent in the oval form of the young heads, which in the species just mentioned are essentially spherical.

M. EURYCAßPOiDEs, Robinson, Proc. Am. acad., xxxvi, 472




{1901). Dr. J. N. Rose has called my attention to the fact that the detached pod mentioned in the description of this species was -erroneously associated with the rest of the material presumably dur- ing the mounting. It is probably the fruit of Acacia farnesiana.

M. invisa, Martius, Flora, xx, Bd. 2, Beibl., 121 (1837). Add synonym M. sepiaria , Micheli, Leguminosae Langlasseanae, 279, as to no. 423, not Benth.

M. Langlassei, Micheli, I. c., 277, t. 22 (1903). From the description and figure it is quite impossible to find a single difference between this species and M. Xanti , Gray, Proc. Am. acad., v, 157 (1861) . If, however, the two prove identical the distribution of the species (Cape St. Lucas, Lower California, and Mt. Jorullo, Mexico) is unusual and interesting.

M. Micheliana, spec. nov. Frutex armata, ramis gracillimis elongatis teretibus purpurascentibus glaberrimis, aculéis sparsis flavo- brunneis gracilibus subrectis paulo recurvatis 3 mm. longis ; petiolis filiformibus 1.5-3 cm. longis glabris obscure sparsissimeque armatis, stipulis filiformibus vel anguste subulatis erectis patente ciliatis, pinnis foliorum unijugis 3-5 cm. longis, foliolis circa 8-jugis oblongis 9-12 mm. longis 3.5-4 mm. latis acutis undique glabris margine ^dpresse ciliato-serrulato ; capitulis laxe racemosis globosis circa 7 mm. diametro (staminibus patentibus exclusis), pedunculis ex axillo geminis orientibus filiformibus 2 cm. longis, floribus glaberrimis, calyce campanulato 1 mm. longo leviter 4-dentato ; corolla erubes- centi 3 mm. longa, dentibus 4 angusti-deltoideis subacutis 1 mm. longis, staminibiis 4, ovario subsessili glabro ; fructu ignoto. - M. sehraji Moides, Micheli, I. c., 279, not Benth. - Mexico : La Correa, Guerrero, alt. 250 m., September, 1898, E. Langlassé , no. 386 (type in hb. Gr.).

M. schrankioides , Benth., a species of British Guiana, to which this plant has been referred, is exceedingly different, having much larger and more numerous appřessed-villous leaflets, hairy ovaries, longer petioles, etc.

M. Nelsonu, Robinson, Proc. Am. acad., xxxiii, 314 (1898). Add synonym M. lignosa , Micheli, Leguminosae Langlasseanae, 278, t. 23 (1903).

M. pAuciFOLiOLATA, Micheli, I. c., 278 (1903). This is just the plant which was described in the Proc. Am. acad., xxxiii, 317 (1898), &s M. laxiflora , var. zygophylloides , Robinson. The reduction of



260 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY.

the leaflets to a single slightly enlarged pair gives a rather distinct habit, but the examination of a series of specimens of the rather variable M. laxiflora , Benth., leads to the conclusion that this plant is only an extreme variation of that species.

M. polyanthoides, spec. nov. Fruticosa 3-5 m. alta, rami» striatis griseo-brunneis aculéis magnis compressis recurvatis atroru- bentibus subaxillaribus munitis; foliis 1.5 dm. longis, pinnis 4-7-jugi& 3-4 cm. longis basi geniculatis stipellatis, rhachide rhachillisque angulatis sparsissime pubescentibus, foliolis 13-17-jugis oblongi» glabris 8 mm. longis 3-4 mm. latis apice rotundatis mucronatis basi obliquis supra viridibus subtus vix pallidioribus ; floribus spicatis ignotis, spicis 2-3 cm. longis breviter pedunculatis, pedunculo puberulo rhachide florífero glabrato ; legumine compressissimo 5-6 cm. longo 10-13 mm. lato irregulariter crenato apice abrupte acuminato stylo tenui saepe falcato breviter rostrato basi longe cuneato-atten- uato, stipiti circa 1 cm. longa, replo val visque setoso-hispidis, seminibus 8. - Mexico : on mountains above Iguala, Guerrero, alt. 1230 m., 5 October, 1900, C. G. Pringle , no. 8408 (type in hb. Gr.).

Distributed as M. polyantha , Benth., but readily distinguished from that species by its more numerous pinnae and leaflets and especially by its long-stiped and somewhat larger fruit. From M. stipitata it differs in the larger leaflets and broader hispid not glabrous pods.

M. rhododactyla, spec. nov. Frutex ramoso 3 m. alto, rami» griseis flexuosis in specimine viso inarmatis, ramulis flavescenti- tomentellis; stipulis parvis subulatis, petiolis propriis 12-16 mm. longis et rhachidibus foliorum circa 4 cm. longis inarmatis tomentellis,. foliis bipinnatis, pinnis circa 9-jugis 2 cm. longis, foliolis 9-14-jugis anguste oblongis haud imbricatis apice rotundatis basi obliquis supra glaberrimis subtus adpresse pubescentibus arete sessilibus 3 mm. longis, floribus pallide roseis dense spicatis, spicis cylindricis 4 cm, longis longe pedicellatis binis vel trinis orientibus in racemis longia terminalibus dispositis ; c^ilyce brevi extus sericeo-pubescenti, corolla 1.6 mm. longa extus sericeo-pubescenti ad mediam in dentes 5 ovato- deltoideos acutiusculos secta; staminibus 10; fructu ignoto. - M. puberula , Micheli, I. c., 279, not Benth. - Mexico: in tropical region at Las Higueritas near the boundary between Michoacan and Guerrero, on granitic soil, alt. 500 m., 11 July, 1898, E. Langlassé *

Although I have never seen authentic material of M. puberula y




Benth., I cannot believe that this plant of Langlassé with its small leaflets glabrous above, its peduncles 1.2 cm. long, and silky-villous flowers, is the species which Bentham (in Hook. Lond. journ. bot., v, 88, & Trans. Linn, soc., xxx, 413) described as having leaflets in 15-40 pairs, 2-2 J lines long, puberulent on both surfaces, spikes very shortly pedicelled, and flowers nearly glabrous.

M. Stipitata, spec. nov. Fruticosa 3-5 m. alta, ramis flexuosis brunneo-griseis inarmatis vel aculéis gracilibus recurvatis subaxillaribus munitisj foliis 1 dm. longis rhachide pubescenti, pinnis circa 5-jugis subremotis, rhachillis pubescentibus prope basim geniculate stipellatis 2 cm. longis, foliolis circa 10-jugis anguste oblongis subacutis 5 mm. longis 1.7 mm. latis margine parce ciliata excepto sub- glabris supra viridibus subtus vix pallidioribus ; floribus spicatis ignotis ; spicis breviter pedunculatis 2-3 cm. longis ; legumine oblongo tenui compressissimo lateraliter crenato 4-5 cm. longo 1 cm. lato abrupte acuminato stylo persistente graciliter rostrato basi cuneato longe graciliterque stipitato valvis minutissime granu- latis inarmatis fuscescentibus plus minusve lucidis, stipite 5-10 mm. longo, seminibus 8. - Mexico: on mountains above Iguala, Guerrero, alt. 1230 m., 5 October, 1900, C. G. Pringle , no. 8406 (type in hb. Gr.).

This number was distributed as M. polyantha , var. lemor , but on re-examination it is found to differ from that plant in the long- stiped pods and more numerous pinnae and leaflets. To M. stipitata may be referred Rose Hay's no. 5331 (hb. U. S. nat. mus.), collected near Puenta de Ixtla, Morelos, 4 July, 1901, the only difference being the somewhat broader spines on the older branches. The flowers present in this specimen are white with shortly 4-dentate calyx, turbinate 4-lobed corolla, the lobes being broadly lanceolate and glabrous, and the stamens 8 in number. The affinity of M. stipitata is evidently with M. polyantha , Benth.

4. Notes on some Polygonums of western North America.

While revising the New England Polygonums of the section Avicularia some months ago,1 I found occasion to examine several

1 See Rhodora, iv, 65-73 1902).



notes on the genus mimosa in mexico and central america

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