170 RUBIACEAE. 



1. Flowers and fruit in racemes. C. Bungei. 

 Flowers and fruit in panicles. 2. 



2. Pods about 5 mm. in diameter : leaves mostly angled : 



twigs hairy. 3. 

 Pods about 8 mm. in diameter : seeds pointed : leaves rarely 



angled : twigs glabrous. 5. 



Pods fully 10 mm. in diameter : seeds obliquely truncate : 

 leaves often angled. (Warder's catalpa). C. speciosa. 



3. Mature leaves glabrous. (Japanese catalpa). C. ovata. 

 Mature leaves pubescent. (Teas' catalpa). 4. 



4. Leaves green. X C. hybrida. 

 Leaves purple while young. X C. hybrida purpurea. 



5. Tree. (Common catalpa). 6. 



Shrub, or usually grafted as a standard. C. bignonioides nana. 



6. Leaves green. C. bignonioides. 

 Leaves yellow. C. bignonioides aurea. 



CHILOPSIS. Desert Willow. 



Deciduous shrubs or small trees with soft dark brown wood 

 with diffused rather large ducts and fine but evident pale medul- 

 lary rays ; slender somewhat angled twigs ; small angled pale 

 homogeneous pith ; whorled or opposite or even scattered raised 

 crescent-shaped small leaf-scars with a single bundle-trace ; no 

 stipule scars ; small compressed roundish buds with 2 nearly 

 valvate outer scales ; simple subsessile willow-like leaves; rather 

 large trumpet-shaped perfect gamopetalous flowers in terminal 

 racemes ; and long slender cylindrical 2-valved capsules and thin 

 winged seeds, long-ciliate especially at the ends. 

 Leaves linear to narrowly lanceolate, entire. C. saligna. 



Family RUBIACEAE. Coffee Family. 



A large heterogeneous family, largely of the tropics, yielding 

 coffee, quinine, ipecac, etc. Bouvardias are among the useful 

 bright-flowered species grown under glass. 



CEPHALANTHUS. Button Bush. 



Deciduous shrubs with moderately slender roundish twigs ; 

 rather 4-sided homogeneous pale brown pith; low half-round 



