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(Melastomatace 18. Monochaetum Compactum Almeda, Sp. Nov. (Fig Almeda: Systematic* of the Genus Monochaetum (Melastomataceae) 111 TABLE 16 Pollen Viability of Monochaetum tenellum, M. floribundum and a Putative Hybrid No. of Anther grains series viable scored M. tenellum Skutch 1687 large 250 98 E small 250 98 E E in M. tenellum X floribundum E ro in n Skutch 1752 large 250 10 small 250 35 M. floribundum Skutch 1748 large 250 99 small 250 99 Marcos, Standley 662)4 (F), Standley 66237 (F); on rd 8-18 mi NW of San Marcos, Steyermark. 3)603 (F, US); 2 mi S of San Sebastian, Sierra Madre mts, Williams, Molina 9 Williams 2)937 (F, GH, NY, US, W); canyon S of San Marcos toward Castalia, Williams, Molina 9 Williams 26177 (F, G); slopes of Volcan Taju- mulco, Williams et al. 271)2 (F, NY). Solola: Guat Hwy #CA1 ca. 31.3 mi W of Panajachel, Almeda 9 E Luteyn 1716 (DUKE, GH, US); 12 km SE of Panajachel, Burch ))30 (USF); Los Encuentros, Seler 23)9 E E (CAS, GH, US); Santa Barbara, Shannon )22 (US; photograph, NY); wet banks and ravines near Nahuala, CO E uo Sierra Madre mts, Williams, Molina 9 Williams 2322) (F, G, NY, W); ravine ca. 4 km E of Godinez, Wil- liams, Molina 9 Williams 2)207 (F, GH, NY, US, W). Totonicapan: cloud forest of Maria Tecum on rd to Los Encuentros, Molina 1)909 (MO, NY, US, WIS); wet bank near Momostenango, Molina 2143) (F, GH, NY); rd between San Francisco El Alto and Momostenango, Standley 84002 (F-, NY); Sierra Madre mts N of San Carlos, Williams, Molina 9 Williams 22)7 4(1, G, NY, W); Sierra Madre mts 20-25 km N of Cristobal, Williams, Molina 9 Williams 22665 (F, G, NY, W). Putative hybrid between Monochaetum tenellum and M. floribundum. — GUATEMALA. Quiche: vicinity of Nebaj, Skutch 17)2 (A, NY). 18. Monochaetum compactum Almeda, sp. nov. (Fig. 30) Frutex erectus ad 2 m alms; rami densi hirsuti, trichomatibus barbellatis aliquando glandulosis. Foliorum lamina elliptica vel elliptico-ovata, (7-)9-23(-28) mm longa et (S-)4-l 1(-1S) mm lata, 5-plinervata, nervorum E pari exteriore plerumque inconspicuo. Inflorescentiae terminales, dichasiales, bracteis ellipticis, ovatis, sub- E 01 orbicularis, obovatis, oblanceolatis ad spathulatis, (2. 5-)4-6(-9) mm longis et 2-5 mm latis. Calycis lobi lan- co £ C ceolati ad oblongi, ad apicem obutsi vel rotundati, 4-6 mm longi et (1 .5-)2-3 mm lati; persistentes. Petala magenta vel atrorosea, anguste elliptica vel obovata, 12.5-19 mm longa et 9-12 mm lata. Staminum maio- rum filamenta 6-8 mm longa, thecis (5-)6-8(-9) mm longis, appendicibus dorsalibus 3-5 mm longis. Stami- num minorum filamenta 7-9 mm longa, thecis 4-5. 5 mm longis, appendicibus dorsalibus 2. 5-4. 5 mm longis. Stylus 5-7 m longus. Hypamhium (maturum) urceolatum vel suburceolatum, 4.5-7 mm longum et 3.5-5(-6) mm latum, strigosum, trichomatibus barbellatis et glandulosis. Semina 0.5-0.8 mm longa, brunnea, minute foveolata, cochleata. Erect, compactly branched shrub 1-2 m tall with terete stems; cauline internodes spreading hirsute. Tri- chomes white or more commonly tawny colored, distinctly barbellate, less than 1 mm long and often inter- III! mixed with purplish, glandular trichomes of similar length on the younger shoots. Nodal trichom.es similar 0O)l —CD —(D —TO CD £ CD CD to the internodal ones, flexuous, 1.5-3 mm long and commonly two or three times the length of the inter- _J CO Q_ D- 112 University of California Publications in Botany Almeda: Systematic* ofth nodal trichomes. Older stems and basal br leaves membranaceous, not markedly ani appressed, barbellate trichomes in 4(-6) w nerves. Lower leaf surface widely spreading elliptic to elliptic-ovate, (7-)9-23(-28) mm lo basally, 5-plinerved below with three elevat< ous for the basal half or third of the blade 1 distally, with the margins entire. Petioles slei mostly terminal, a 2-3(-4) times compound < (to 1 cm) between floral bracts; overall sym aborted development of lateral branches in e mm long, 2-5 mm wide with slender (somewh bracts narrowly elliptic to ovate and the uppe obtuse apically, acute to cuneate basally; upp ally pustulate trichomes and spreading, glan appressed, barbellate trichomes and spreadii obconic, often deep burgundy with appressec with smooth, spreading, glandular trichomes ceolate, 4-7 mm long, 3.5-5(-6) mm in diame Sepals spreading to ascending, narrowly lanc< usually copiously strigose without, 4-6 mm Ion glabrous, or with one or two trichomes apicall mm wide. Antepetalous stamina!filaments 6- mm wide, the apical pore 0.5 or less in diamet 3-5 mm long, 0.5 mm wide. Antesepalous sta with red basally along the connective, 4-5.5 I appendages yellow, linear to linear-lanceolat< glandular trichome at the apex. Ovary (at m setose apically. Style 5-7 mm long. Seeds 0.5- arcuate. Type.—PANAMA. Chiriqui Province: Llanos can on rd to Cerro Punta, elev. 1900-2000 n DUKE; isotypes, BR, F, G, GH, K, LL, ME* Flowering. —Apparently at peak flowering fr during most intervening months. Habitat and distribution. —Known only fron cene volcano in the Province of Chiriqui, Panar dally common along the Llanos del Volcan desc of the shrubby vegetation. It has also been colle( in open meadows above treeline. Although it is I habitats, it also occurs less frequently along tr northern and eastern slopes of Baru (fig. 17). The plants included here form a mo: which differs from other species by it elliptic-ovate leaves (mostly 9-23 mm k H elliptic to narrowly obovate petals. One specimen, McCorkle C-150, col differs from typical material in having cauline trichomes that are appressed ra Fig. SO. Monochaetum compactum. A, habit, X \i; B, petal, X ca. 3; C,E, abaxial surface of representa- be a local response to environmental cc tive floral bracts, X 7; D, mature hypanthium and calyx lobes, X 4; F, abaxial surface of a typical leaf, X 5; nition. G, seeds, X 22; H, ovary, style and unreceptive stigma, X 5. (A & H from Almeda 9 Wilbur 1564; B-G from Although only two collections of M. Almeda 9 Wilbur 1024.) when he prepared a treatment of the 1 ions in Botany Almeda: Systematics of the Genus Monochaetum (Melastomataceae) 113 nodal trichomes. Older stems and basal branches woody, reddish brown, the bark exfoliating. Principal leaves membranaceous, not markedly anisophyllous, upper leaf surface with antrorsely spreading or appressed, barbellate trichomes in 4(-6) well-defined, longitudinal belts between the impressed primary nerves. Lower leaf surface widely spreading hirsute on the primaries and hirtellous between them. Blades elliptic to elliptic-ovate, (7-)9-23(-28) mm long, (3-)4-l 1(-13) mm wide, acute apically, subacute to rounded basally, 5-plinerved below with three elevated central nerves, the submarginal pair elevated and conspicu- ous for the basal half or third of the blade length, becoming depressed and confluent with blade margins distally, with the margins entire. Petioles slender, (l-)2-6(-9) mm long, to 1 mm wide, hirsute. Inflorescence mostly terminal, a 2-S(-4) times compound dichasium appearing congested because of the short internodes (to 1 cm) between floral bracts; overall symmetry of the inflorescence often appearing uneven because of aborted development of lateral branches in each of the S-flowered dichasial units. Floral bracts (2.5-)4-6(-9) mm long, 2-5 mm wide with slender (somewhat compressed) petioles 1-3 mm long; lower (somewhat larger) bracts narrowly elliptic to ovate and the uppermost rotund, obovate, oblanceolate, or spatulate, subacute to obtuse apically, acute to cuneate basally; uppermost bracts usually 3-nerved, covered with a mixture of bas- ally pustulate trichomes and spreading, glandular trichomes. Floral pedicels (5-)6-10(-12) mm long with ± appressed, barbellate trichomes and spreading, glandular ones. Hypanthium (at anthesis) campanulate to obconic, often deep burgundy with appressed, barbellate trichomes 0.5-2 mm long, frequently intermixed with smooth, spreading, glandular trichomes to 1 mm long. Hypanthium (at maturity) urceolate to subur- ceolate, 4-7 mm long, 3.5-5(-6) mm in diameter at the broadest point; longitudinal ribs obscure on drying. Sepals spreading to ascending, narrowly lance-deltoid or linear-oblong, obtuse to rounded apically, ciliate, usually copiously strigose without, 4-6 mm long, (1.5-)2-3 mm wide basally, persistent. Petals deep magenta, glabrous, or with one or two trichomes apically, broadly elliptic to narrowly obovate, 12.5-19 mm long, 9-12 mm wide. Antepetalous staminalfilaments 6-8 mm long; anthers reddish-magenta, (5-)6-8(-9) mm long, 1 mm wide, the apical pore 0.5 or less in diameter; appendages reddish-magenta but yellow apically, falcate, 3-5 mm long, 0.5 mm wide. Antesepalous staminal filaments 7-9 mm long; anthers yellow, often suffused with red basally along the connective, 4-5.5 mm long, 1 mm wide, apical pore ca. 0.5 mm in diameter; appendages yellow, linear to linear-lanceolate, 2.5-4.5 mm long, 0.5-1 mm wide, rarely bearing a stout, glandular trichome at the apex. Ovary (at maturity) ovoid to obovoid, the body essentially glabrous but setose apically. Style 5-7 mm long. Seeds 0.5-0.8 mm long, light brown, minutely foveolate, cochleate to arcuate. Type.—PANAMA. Chiriqui Province: Llanos on W side of Volcan Chiriqui ca. 4 mi NE of El Hato del Vol- can on rd to Cerro Punta, elev. 1900-2000 m, December 26, 1971, Almeda-9 Wilbur 1024 (Holotype, DUKE; isotypes, BR, F, G, GH, K, LL, MEXU, MICH, MO, NY, P, PMA, UC, US, W).
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