STANDLEY — TREES AND SHRUBS OF MEXICO. 735 



Peduncle adnate to a bract; fruit nutlike 1. TILIA. 



Peduncle not adnate to a bract; fruit not nutlike. 

 Fruit unarmed. 



Fruit silique-like, long and slender; flowers small 2. CORCHOB.US. 



Fruit a thick broad capsule ; flowers large. 



Capsule thin, compressed, bivalvate 3. BELOTIA. 



Capsule hard and woody, 5-angled, 5-valvate__ 4. LTJEHEA. 



Fruit armed with spines or bristles, 



- Anthers linear; fruit depressed 5. APEIBA. 



Anthers short; fruit not depressed. 



Fruit compressed, bivalvate, radiately bristly along the edges. 



6. HELIOCARPUS. 



Fruit not compressed, usually indehiscent, covered on all sides with 



spines 7. TRIUMFETTA. 



1. TILIA L. Sp. PI. 514. 1753. 



Trees, the pubescence of simple or stellate hairs; leaves usually obliquely 

 cordate, serrate ; flowers white or yellowish, in axillary or terminal cymes, 

 the peduncle winged with a large, foliaceous, partly adnate bract; sepals 

 distinct ; fruit globose, nutlike, indehiscent, 1 or 2-seeded. 



The English names applied to species of Tilia are " linden " and " basswood." 

 The trees are excellent shade trees and are often planted for this purpose. 

 They are well adapted to street planting. The wood is light brown, soft, and 

 light, with a specific gravity of 0.40 to 0.45. It is employed extensively for 

 construction purposes, furniture, carriages, woodenware, and paper pulp. The 

 tough fiber of the bark is sometimes utilized for cordage and rough mats. 

 The sap is said to contain considerable sugar. The sweet-scented flowers yield 

 an excellent quality of honey. The bark and leaves in water give a mucilagi- 

 nous infusion. The flowers of T. europaea L. are official in the German Pharma- 

 copoeia. They contain a colorless fragrant volatile oil, and are employed as 

 a remedy for hysteria and indigestion. 



Leaves glabrous beneath except sometimes in the axils of the veins. 



Leaves barbate beneath in the axils of the veins 1. T. floridana. 



Leaves entirely glabrous beneath 2. T. mexicana. 



Leaves finely or coarsely stellate-tomentose beneath. 



Tomentum of the lower leaf surface loose and spreading, especially along 

 the veins, brownish 3. T, occidentalis. 



Tomentum fine, close, and grayish 4, T. hougM. 



1. Tilia floridana Small, Fl. Southeast. U. S. 761, 1335. 1903. 



Chihuahua, Coahuila, and Nuevo Leon. Southeastern United States; type 

 from Florida. 



Leaves 7 to 12 cm. long, 5 to 7.5 cm. wide, short-acuminate, serrate with ab- 

 ruptly mucronate teeth, the lower surface at first with a few scattered stellate 

 hairs but soon glabrous ; bracts long-pedunculate ; petals 6 to 7 mm. long ; 

 fruit about 8 mm. long, densely tomentulose. 



The Mexican specimens have been determined by Dr. C. S. Sargent. One 

 specimen from Nuevo Leon (Pringle 10188) was distributed as a new species. 



2. Tilia mexicana Schlecht. Linnaea 11: 377. 1837. 



Known only from the type locality, Cuesta Grande de Chieonquiaco, Veracruz. 

 Leaves very oblique at base, not cordate, 10 cm. long and 6 cm. wide or 

 smaller, short-acuminate, with very acute gland-tipped teeth. 



