STANDLEY TREES AND SHRUBS OF MEXICO. 1033 



afford little shade, while their roots spread in every direction, making it im- 

 possible to grov/ other plants in their vicinity. They are not particularly 

 handsome trees, and their only good feature is rapidity of growth. 



Calyx limb closed in bud or nearly so, in anthesis longitudinally cleft or cir- 

 cumscissile. 



Flowers umbellate 1. CALYCORECTES. 



Flowers solitary, cymose, or paniculate. 



Calyx limb circumscissile ; petals 1 or 2 or none__2. CALYPTRANTHES. 

 Calyx limb cleft longitudinally in anthesis, or partly circumscissile but re- 

 maining attached to the tube at one side ; petals 4 or 5__3. PSIDIUM. 

 Calyx limb not closed in bud, the sepals imbricate. 

 Embryo circinate, the radicle elongate. 



Flowers numerous, in cymes ; testa of seed thin 4. PIMENTA. 



Flowers solitary or rarely racemose ; testa horny 5. MYRTTJS. 



Embryo not circinate, the cotyledons and radicle folded together, the radicle 

 sometimes very short. 

 Radicle very short ; flowers variously arranged but not paniculate. 



6. EUGENIA. 

 Radicle elongate; flowers in loose panicles 7. MYRCIA. 



1. CALYCORECTES Berg, Linnaea 27: 317. 1854. 



1. Calycorectes mexicanus Berg, Linnaea 27: 318. 1854. 



Type from mountains of Oaxaca. 



Branchlets puberulent ; leaves petiolate, oblong, 7.5 to 10 cm. long, 2.5 to 

 4 cm. wide, obtuse-acuminate, acute at base, glabrous above, puberulent or 

 glabrate beneath ; flowers in 2 to 6-flowered umbels equaling or shorter than 

 the petiole, the pedicels 2 mm. long, puberulent ; calyx globose, apiculate, rup- 

 turing into 4 ovate lobes ; petals 4, orbicular, 2 mm. long. 



2. CALYPTRANTHES Swartz, Prodr. Veg. Ind. Occ. 79. 17S8. 



Trees or shrubs ; flowers small, in axillary and terminal cymes or panicles ; 

 calyx tube turbinate, the limb closed in bud, in anthesis circumscissile and 

 deciduous ; petals 1 or 2 or none ; fruit baccate, 2 or 3-celled, usually 1 or 

 2-seeded. 



The flower buds of the Brazilian C. aromatica St. Hil. are used as a spice. 



Leaves sessile, cordate at base 1. C. karwinskyana. 



Leaves petiolate, rounded to acute at base. 

 Leaves linear-lanceolate, 10 to 12.5 cm. long, 1.5 to 2 cm. wide. 



2. C. lindeniana. 

 Leaves lanceolate to oval. 



Leaves rounded at base, the petioles very short and thick. 



3. C. euryphylla. 

 Leaves acute or obtuse at base, the petioles comparatively long and slender. 



Leaves obtuse 4. C. zuzygium. 



Leaves acuminate. 



Buds glabrous ; flowers mostly pedicellate 5. C. schiedeana. 



Buds sericeous ; flowers sessile 6. C. pendula. 



1. Calyptranthes karwinskyana Berg, Linnaea 29: 214. 1857. 



Known only from the type locality, " Mesa Chica," southern Mexico. 



Glabrous throughout ; leaves ovate-oblong, 9 to 11.5 cm. long, 3.5 to 5 cm. 

 wide, acuminate, clasping at base ; cymes equaling the leaves, the flowers in 

 clusters of 3 or 5, sessile, the buds 4 mm. long; petals none. 



