| bole | habit | large trees 30+ m or small trees |
| bole | buttresses | absent |
| bole | spines | absent |
| bole | bark_outer_color | gray or brown |
| bole | bark_peeling | not peeling |
| bole | slash_color | red or brown |
| bole | slash_lamination | absent |
| bole | slash_odor | absent |
| bole | exudate | absent |
| twig | terminal_buds_enclosed_by_leaves | no |
| twig | clumped_hairs | absent |
| twig | complex_hairs | absent |
| twig | stinging_hairs | absent |
| twig | mature_twig_indumentum | absent |
| twig | twig_cross_section | terete |
| twig | leaf_location | spaced down twig |
| twig | leaf_insertion | whorled |
| twig | leaves_per_whorl | 5-20 |
| stipule | stipules | absent |
| leaf | leaf_complexity | simple |
| leaf | petiole_length | absent |
| leaf | leaf_similarity | homophyllus |
| leaf | leaf_texture | coriaceous |
| leaf | leaf_base | symmetrical |
| leaf | leaf_dissection | not dissected |
| leaf | leaf_margins | entire |
| leaf | margin_plane | flat |
| leaf | leaf_apex_shape | acuminate |
| leaf | primary_venation | absent |
| leaf | domatia | absent |
| leaf | leaf_glands | absent |
| leaf | marginal_and_petiolar_glands | absent |
| leaf | hairs_on_mature_leaf | absent |
| inflor | inflorescence | multiple |
| inflor | inflorescence_position | terminal |
| inflor | inflorescence_axis | unbranched |
| inflor | specialized_inflorescence_units | absent or present |
| inflor | type_of_inflorescence_unit | heads |
| flower | numerous_persistant_floral_bracts | absent |
| flower | floral_sexuality | at least some unisexual |
| flower | floral_oecy | monoecious or dioecious |
| flower | peduncle | absent |
| flower | flower_size | microscopic |
| flower | floral_symmetry | actinomorphic |
| flower | floral_column | absent |
| flower | hypanthium | absent |
| flower | disk | absent |
| flower | perianth | absent |
| male | stamen_number | 1 |
| male | stamen_filaments | present |
| male | stamen_fascicling | all free or fascicled |
| male | stamen_size | equal sizes |
| male | anther_locule_number | 4 |
| male | anther_fixation | basifixed |
| male | anther_adornment | not awned |
| male | anther_dehiscence | long slits |
| female | ovary_position | superior |
| female | carpel_arrangement | syncarpous |
| female | carpel_number | 2 |
| female | locule_number | 2 |
| female | style_presence | solitary including joined |
| female | stigma_lobes | 2 |
| female | stigma_shape | not distinctive |
| fruit | common_fruit_type | samara |
| fruit | uncommon_fruit_type | cone |
| fruit | fruit_fleshiness | not fleshy |
| fruit | fruit_aggregation | multiple or aggregate |
| fruit | fruit_dehiscence | dehiscent |
| fruit | fruit_accessory_tissue | no fleshy perianth parts |
| fruit | fruit_wings | present |
| seed | seed_number_and_multiple | 1/100 |
| seed | seed_size | barely visible |
| seed | seed_wings | present |
| seed | seed_ruminations | seed uniform |
| seed | seed_aril | absent |
| seed | seed_endosperm | absent |
| info | field_characters | includes Ceuthostoma and Gymnostoma. Leaves resembling horsetails; inflorescence cone-like |
